United Kingdom · checked 2026-10-26 · Medium confidence

Knife carry law in Northern Ireland

Section 139 Criminal Justice Act 1988 applies in Northern Ireland with the same wording as England: any blade or point in public is an offence unless you prove good reason or lawful authority, with a non-locking folding pocketknife (edge up to 3 inches) excluded. Flick/gravity knives are banned for sale; private possession bans are still pending.

This summary rests on mostly official, partly secondary sources. Open questions are listed at the end. Treat anything marked unclear as a reason to leave the item at home.

How we apply the law

Rules are checked from the top. The first one that fits decides. Every verdict on this site comes from this list, not from hand typed cells.

1ProhibitedAny knife or tool, gravity or flick opening or automatic
Flick, gravity and butterfly knives: sale, hire and gifting are offences (Art 53, Order 1988 list) and UK import is banned. The Department of Justice says public possession is already an offence; a ban on private possession is awaiting commencement (planned early 2027).
Source
2UnclearAny knife or tool, spring assisted
Spring-assisted knives: Art 53 in force in NI uses the old definition (mechanism in or attached to the handle). The wider 2019 definition is not yet commenced in NI. Guidance and case law are from England. Treat as needing a good reason.
Source
3No restriction foundA folding knife, no lock, cutting edge up to 76.2 mm
A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Source
4Reason neededA folding knife, no lock
A non-locking folder with an edge over 3 inches is inside s139. You must prove good reason or lawful authority.
Source
5UnclearA folding knife, ring lock or other lock
Ring locks and unusual or disabled locks: no authority found for NI or England. Treat as needing a good reason.
Source
6Reason neededA folding knife, liner lock, frame lock, back lock, axis lock, compression lock or button lock
English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Source
7No restriction foundA multitool, no lock, cutting edge up to 76.2 mm
A multitool whose blade cannot lock and whose cutting edge is 3 inches or less fits the s139 exemption on its wording. No NI case found.
Source
8Reason neededA multitool
A multitool with a locking blade or an edge over 3 inches is within s139; you need a good reason such as work.
Source
9Reason neededA fixed blade
Fixed blades are never within the exemption. Carrying one in public needs a good reason (work, religion, national costume are listed).
Source
10UnclearA keychain tool or scissors only
s139 covers any article with a blade or sharp point except a folding pocketknife. Keyring tools or scissors are untested; blades disguised as everyday objects such as keys are banned.
Source
11UnclearAnything else
Combination not covered above. Assume a good reason is needed.
Source

34 popular knives and tools, checked here

Specifications come from the makers. Where a maker does not publish the cutting edge length, a length rule can only be answered if even the full blade length falls on one side of the line. Otherwise the result is unclear, on purpose.

Product	Specs	Result
Victorinox Cadet (Alox)	blade 64 mm (2.52 in); cutting edge not published	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Victorinox Classic SD	blade 40 mm (1.57 in); cutting edge not published	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Victorinox Climber	blade 67 mm (2.64 in); cutting edge not published	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Nagao Kanekoma Higonokami SK (Niwaki-sold Kanekoma)	blade 71 mm (2.80 in); cutting edge not published	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Victorinox Huntsman	blade 67 mm (2.64 in); cutting edge not published	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
W.R. Case & Sons Mini Trapper	blade 69.9 mm (2.75 in); cutting edge not published	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Spyderco Roadie	44 mm cutting edge (1.73 in)	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Victorinox Spartan	blade 67 mm (2.64 in); cutting edge not published	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Spyderco Squeak	44 mm cutting edge (1.73 in)	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
W.R. Case & Sons Trapper	76.2 mm cutting edge (3.00 in)	No restriction found Why A non-locking folding pocketknife with a cutting edge of 3 inches (76.2 mm) or less is outside s139. No specific restriction found for carrying it in public; school and prison rules still apply.
Gerber Dime	blade 38.1 mm (1.50 in); cutting edge not published	Unclear Why s139 covers any article with a blade or sharp point except a folding pocketknife. Keyring tools or scissors are untested; blades disguised as everyday objects such as keys are banned.
Kershaw Leek	blade 76.2 mm (3.00 in); cutting edge not published	Unclear Why Spring-assisted knives: Art 53 in force in NI uses the old definition (mechanism in or attached to the handle). The wider 2019 definition is not yet commenced in NI. Guidance and case law are from England. Treat as needing a good reason.
Leatherman Micra	blade 40.6 mm (1.60 in); cutting edge not published	Unclear Why s139 covers any article with a blade or sharp point except a folding pocketknife. Keyring tools or scissors are untested; blades disguised as everyday objects such as keys are banned.
Opinel No.07 Stainless Steel	blade 80 mm (3.15 in); cutting edge not published	Unclear Why Ring locks and unusual or disabled locks: no authority found for NI or England. Treat as needing a good reason.
Opinel No.08 Stainless Steel	blade 85 mm (3.35 in); cutting edge not published	Unclear Why Ring locks and unusual or disabled locks: no authority found for NI or England. Treat as needing a good reason.
CRKT Squid Assisted	blade 60.2 mm (2.37 in); cutting edge not published	Unclear Why Spring-assisted knives: Art 53 in force in NI uses the old definition (mechanism in or attached to the handle). The wider 2019 definition is not yet commenced in NI. Guidance and case law are from England. Treat as needing a good reason.
Leatherman Squirt PS4	blade 40.6 mm (1.60 in); cutting edge not published	Unclear Why s139 covers any article with a blade or sharp point except a folding pocketknife. Keyring tools or scissors are untested; blades disguised as everyday objects such as keys are banned.
Victorinox Swiss Card Classic	blade length not published	Unclear Why s139 covers any article with a blade or sharp point except a folding pocketknife. Keyring tools or scissors are untested; blades disguised as everyday objects such as keys are banned.
Buck 110 Folding Hunter	blade 95.3 mm (3.75 in); cutting edge not published	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Leatherman Arc	blade 70.1 mm (2.76 in); cutting edge not published	Reason needed Why A multitool with a locking blade or an edge over 3 inches is within s139; you need a good reason such as work.
Benchmade Bugout	blade 82.3 mm (3.24 in); cutting edge not published	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Morakniv Companion (stainless, Hi-Vis Orange shown)	blade 104 mm (4.09 in); cutting edge not published	Reason needed Why Fixed blades are never within the exemption. Carrying one in public needs a good reason (work, religion, national costume are listed).
Spyderco Delica 4 (Lightweight)	65 mm cutting edge (2.56 in)	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
CIVIVI Elementum	blade 75.2 mm (2.96 in); cutting edge not published	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
ESEE Izula-II	blade 66.8 mm (2.63 in); cutting edge not published	Reason needed Why Fixed blades are never within the exemption. Carrying one in public needs a good reason (work, religion, national costume are listed).
Spyderco Ladybug 3	43 mm cutting edge (1.69 in)	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Benchmade Mini Bugout	blade 71.6 mm (2.82 in); cutting edge not published	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Spyderco Para 3	67 mm cutting edge (2.64 in)	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Gerber Paraframe I (stainless, plain edge)	blade 76.5 mm (3.01 in); cutting edge not published	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Ontario Knife Company RAT Model 1 (RAT I)	blade 88.9 mm (3.50 in); cutting edge not published	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Leatherman Skeletool CX	blade 66 mm (2.60 in); cutting edge not published	Reason needed Why A multitool with a locking blade or an edge over 3 inches is within s139; you need a good reason such as work.
CRKT Squid (Thumbstud)	blade 54.76 mm (2.16 in); cutting edge not published	Reason needed Why English precedent (Deegan, Harris, Sharma) says a blade that locks is not a 'folding pocketknife'. NI s139 has identical wording, but we found no NI-court decision. Assume a good reason is needed.
Victorinox SwissTool Spirit X	blade length not published	Reason needed Why A multitool with a locking blade or an edge over 3 inches is within s139; you need a good reason such as work.
Leatherman Wave Plus	blade 74.2 mm (2.92 in); cutting edge not published	Reason needed Why A multitool with a locking blade or an edge over 3 inches is within s139; you need a good reason such as work.

What the verdict does not cover

Public transport and restricted zones: 'Public place' covers anywhere the public have or are permitted access, on payment or not (s139(7)). UK airport hand-luggage rule: no sharp/pointed blade or blade over 6 cm in hand luggage (gov.uk; applies at NI airports to UK flights, not checked separately).
Schools, workplaces and events: s139A (NI version) makes it an offence to have a s139 article or offensive weapon on school premises, with defences of good reason/lawful authority, work, educational purposes, religion, national costume; the carrier must prove them. The NI s139A text does not mention further-education premises, though s141(1E) does, so coverage there is unclear. Police can enter and search school premises (s139B).
In a vehicle: No NI-specific text read. England & Wales case law on 'has with him' (knife within reach, e.g. in a car) is persuasive only. A vehicle on a public road is a public place.
Age limits: Selling a knife or blade to under-18s is an offence (Art 54, 1996 Order); non-locking folding knives of 3 inches or less are exempt under the UK-wide Exemption Order 1996 (not specifically checked for NI). No minimum age to carry found.
Buying and importing: Residents can buy ordinary knives. Remote-sale age checks (Art 54A) and OWA 2019 Part 3 delivery offences: England/Wales and Scotland commencement dates are shown, but we found none for NI, so whether NI-specific delivery offences are live is unverified. Banned weapons cannot be imported (gov.uk UK-wide guidance). The 2026 Act provisions on photo-ID checks for NI online sales (s34) await a Department of Justice commencement order.
Penalties: s139 (NI): up to 12 months and/or fine up to the statutory maximum on summary conviction; up to 4 years and/or fine on indictment.
Recent changes: 2026: Department of Justice published draft rules (SL1 to Justice Committee, 2 July 2026) to commence the Offensive Weapons Act 2019 private-possession offences for flick/gravity knives and listed weapons, add zombie, zombie-style, cyclone knives and ninja swords to the NI banned list, and run a 3-month surrender and compensation scheme first. A surrender scheme and bins were being rolled out in October 2026. Press reports (Derry Journal 12 Oct 2026) say the offences follow after the three months. We could not confirm the final made rules or exact dates.
Pending changes: Private-possession bans, zombie/zombie-style/cyclone/ninja sword additions to the NI list, wider flick-knife definition (DoJ planned early 2027). Crime and Policing Act 2026 ss34, 39-41, 43 (NI age verification and bulk-sale reporting) await DoJ orders (s255(8)).

Reasons the authorities have accepted

Use at work
Religious reasons (kirpan)
National costume
Taking a knife to or from surrender at a police station under the planned scheme: DoJ guidance says this is likely a good reason if sealed and concealed in transit

Sources

Criminal Justice Act 1988 s139 (N.I. version)
“It shall be a defence for a person charged with an offence under this section to prove that he had good reason or lawful authority”
Criminal Justice Act 1988 s139A (school premises, N.I. version)
“Any person who has an article to which section 139 of this Act applies with him on school premises shall be guilty of an offence.”
Criminal Justice (NI) Order 1996 Art 53 (flick and gravity knives)
“any knife which has a blade which opens automatically by hand pressure applied to a button, spring or other device”
NI Assembly Justice Committee SL1 on commencing private-possession offences
“Possession of these weapons in public is already an offence in Northern Ireland.”
GOV.UK: Selling, buying and carrying knives and weapons

What we could not confirm

Whether the draft DoJ rules were made as drafted and when the private-possession offences start.
Whether NI courts follow Deegan/Sharma on locking folders (no NI authority read).
Commencement of OWA 2019 ss38-42 (delivery) in NI not found.
NI s139A and further-education premises coverage.
nidirect page for NI knife law returned 404; no nidirect source used.

Keep going

General information, not legal advice. Know something we got wrong? Tell us and include a source.