New Hampshire generally allows adults who are not otherwise prohibited to own and carry common manual, fixed-blade, automatic, OTF, and balisong knives. State law focuses mainly on unlawful use, prohibited persons, and sensitive locations rather than imposing a general adult blade-length or carry-permit rule. [1] [2]
Two limits matter immediately: qualifying convicted felons may not possess listed knives and other deadly weapons, and knives capable of causing death or serious bodily injury are prohibited in court areas.
What knives may an eligible adult own?
New Hampshire does not maintain a general state list banning ordinary pocket knives, fixed blades, switchblades, OTF knives, gravity knives, or balisongs for eligible adults. RSA 625:11 defines a “deadly weapon” by the way an item is used, intended to be used, or threatened to be used—not simply because it is a knife. [1]
This does not make threatening or criminal use lawful. A practical tool can become a deadly weapon under the statute when the manner of use or threatened use is capable of causing death or serious bodily injury.
May you carry a knife openly or concealed?
New Hampshire does not impose a general knife-carry license or a statewide adult blade-length limit for lawful open or concealed carry. Keep a carried knife closed or securely sheathed and use it only for lawful purposes.
Do not confuse permissive carry rules with unrestricted location access. Courts, schools, employers, venues, federal facilities, and private property may apply separate rules.
Who is prohibited from possessing certain knives?
RSA 159:3 makes it a Class B felony for a person with specified felony convictions to possess or control listed weapons, including a stiletto, switchblade knife, dagger, dirk-knife, and other deadly weapons. The exact conviction categories and statutory affirmative defense should be reviewed in the current text. [2]
This restriction is not a general ban on those knife types for adults who are legally eligible to possess them.
What age and transfer rules matter?
The current statutes reviewed for this article do not create the former article’s claimed statewide rule that every person under 18 needs adult supervision or a hunting or fishing license to carry any knife over three inches. That statement has been removed.
RSA 159:24 does restrict transferring a “martial arts weapon”—a category that can include certain knives—to a person under 18 without written consent from a parent or guardian, subject to listed family and estate exceptions. [4] Retailer policies and school rules may be stricter.
Where are knives restricted?
RSA 159:19 prohibits knowingly carrying a firearm or other deadly weapon, openly or concealed, in a courtroom or area used by a court. Because the statutory deadly-weapon definition includes a knife depending on its capability and manner of use or intended use, the safe rule is to bring no knife into a New Hampshire court area unless specifically authorized. [3]
New Hampshire’s safe-school framework requires school rules and district policies concerning weapons and violent acts. It should not be summarized as a single statewide criminal ban on every knife at every college or school. Check the specific school’s current policy, and do not bring a knife onto school property without clear authorization. [5]
Does state preemption limit local knife ordinances?
Yes. RSA 159:26 places authority over knife sale, purchase, ownership, use, possession, transportation, licensing, permitting, taxation, and related matters with the state. It also declares unauthorized municipal knife regulations null and void. Local governments retain specified zoning authority over knife businesses and authority allowed by other statutes. [6]
This corrects the previous article’s statement that New Hampshire lacks comprehensive knife preemption.
What vehicle, federal, and private-property rules apply?
New Hampshire does not impose a general trunk-or-locked-container rule for lawful adult knife transport. Secure the knife so it cannot move or open during travel, and check the law of every state entered.
Federal buildings, secure facilities, airlines, employers, venues, and private-property owners may prohibit knives independently of state carry law. The Transportation Security Administration prohibits knives in carry-on baggage except for plastic or round-bladed butter knives; checked-baggage and airline requirements still apply. [7]
What should you verify before carrying?
- Whether you are legally eligible under RSA 159:3.
- Whether the destination is a courtroom, court area, school, federal facility, secure venue, workplace, or private property.
- Whether the knife could be treated as a martial arts weapon in a transfer to someone under 18.
- Whether another state’s law applies during the trip.
Conclusion
New Hampshire is generally permissive for lawful adult knife ownership and carry, including automatic knives. The clearest statutory limits concern prohibited persons, court areas, unlawful use, some transfers to minors, and separate property or institutional rules. State preemption provides substantial uniformity across municipalities.
Last reviewed: August 24, 2026.
This article provides general information, not legal advice. Knife laws and their interpretation can change and may depend on the person, location, conduct, property rules, and the way a knife is used or intended to be used. Verify current official sources or consult a qualified New Hampshire attorney about a specific situation.
Sources & References
- [1] New Hampshire RSA 625:11. General definition of “deadly weapon.”
- [2] New Hampshire RSA 159:3. Possession restrictions for people with specified felony convictions.
- [3] New Hampshire RSA 159:19. Courthouse security and deadly-weapon restriction.
- [4] New Hampshire RSA 159:24. Transfer of martial arts weapons to people under 18.
- [5] New Hampshire RSA 193-D:2. State Board and school-district safe-school rulemaking and policy framework.
- [6] New Hampshire RSA 159:26. State jurisdiction and preemption for knives.
- [7] Transportation Security Administration — Knives. Federal carry-on and checked-baggage guidance.
