Maryland Knife Laws: Open Carry, Concealed, and Penalties

Maryland knife laws draw a sharp line between manual folding knives, which you can generally carry anywhere in the state without restriction, and a specific list of “weapons” (switchblades, bowie knives, dirk knives, star knives, and razors) that cannot be carried concealed and cannot be carried openly with intent to injure. Breaking either rule is a misdemeanor punishable by up to three years in jail and a $1,000 fine.¹

Which Knives Maryland Treats as Weapons

Criminal Law § 4-101 defines “weapon” by listing specific items: dirk knives, bowie knives, switchblade knives, star knives, sandclubs, metal knuckles, razors, and nunchaku.¹ If your knife fits one of those categories, the statute’s carry restrictions apply to you. Gravity knives are not on the list, even though many other states restrict them.

The prohibitions themselves use the phrase “dangerous weapon of any kind.” Maryland courts treat the named items as inherently dangerous, so a person carrying a concealed bowie knife doesn’t have to be doing anything threatening to be charged. Other objects can also be treated as dangerous weapons depending on how they’re carried or used, but the listed categories are always presumed dangerous.

The Penknife Exception

The same statute carves out a category that swallows most everyday carry: “Weapon” does not include “a penknife without a switchblade.”² A penknife falls outside the concealed carry ban and the open-carry-with-intent prohibition entirely.

Maryland courts read “penknife” broadly. In Bacon v. State (1991), the Court of Special Appeals looked at a large folding Buck knife with a locking blade and held it was still a penknife, observing that penknives “today are commonly considered to encompass any knife with the blade folding into the handle, some very large.” A locking mechanism, the court said, is merely a “protective feature” that doesn’t change the classification. Bacon was acquitted. A folding knife with a four- or five-inch locking blade is a penknife under Maryland law as long as it opens manually.

The qualifier “without a switchblade” is where the exception ends. If pressing a button or flicking a switch deploys the blade on its own, it’s a switchblade regardless of blade length. Assisted-opening knives, where you start the blade by hand and a spring finishes the motion, sit in a gray area that Maryland courts have not definitively resolved. Carrying one concealed carries some legal risk.

Concealed Carry

Section 4-101(c)(1) flatly prohibits carrying a dangerous weapon concealed on or about the person.¹ No intent has to be shown. If an officer finds a concealed bowie knife, switchblade, dirk knife, or star knife on you, the concealment itself is the offense.

Penknives are not covered by this prohibition because the statute excludes them from the definition of “weapon.” A manual folding knife clipped inside a pocket is legal to carry concealed anywhere in Maryland at the state level. Local ordinances may add limits.

Open Carry

Open carry of listed weapons (a bowie knife, dirk knife, or fixed-blade knife, for example) is legal in Maryland, but § 4-101(c)(2) bans carrying a dangerous weapon openly “with the intent or purpose of injuring an individual in an unlawful manner.”¹ Without that intent, there’s no blade-length restriction on open carry at the state level.

Courts have read “unlawful intent” broadly. In Anderson v. State (1992), the court held that carrying a knife merely to display it as a deterrent to potential aggressors, with no plan to actually stab anyone, still counted as carrying a weapon with unlawful purpose. If your reason for openly carrying a bowie knife is personal protection or intimidation, Maryland courts consider that unlawful. Carrying the same knife for work, camping, or another practical, non-defensive purpose is treated differently.

Knives in a Vehicle

The statute doesn’t specifically say whether a knife stored inside a vehicle counts as concealed on or about the person. A knife in a glove compartment or center console could be treated as concealed carry. The safer assumption is that a weapon-classified knife stored within reach in a vehicle can support a concealed carry charge. Transporting such a knife in a locked case in the trunk, separated from the passenger compartment, reduces that risk. Penknives are not subject to the concealed carry ban regardless of where in the vehicle they sit.

Where You Cannot Carry Any Knife

Public Schools

Criminal Law § 4-102 makes it illegal to carry or possess “a firearm, knife, or deadly weapon of any kind on public school property.” The word used is “knife,” not “weapon.” Even a small penknife that’s legal everywhere else in the state is prohibited on school grounds, including school buses and facilities used for school-sponsored events. The penalty matches § 4-101: up to three years and a $1,000 fine.³ Narrow exceptions apply to on-duty law enforcement, school security personnel, organized educational shooting activities, and people invited by a school principal for a historical demonstration.

Government Buildings and Courthouses

Courthouses, state offices, and many government buildings prohibit knives through their own security policies, enforced at entry checkpoints. These are administrative rules in most cases rather than criminal prohibitions, but refusing to surrender a knife at courthouse security can lead to denial of entry or a disorderly conduct charge.

Local Ordinances

Maryland has no state preemption law for knives. Cities and counties are free to pass their own rules that go further than the state statute. Baltimore City, for example, prohibits the sale, carry, or possession of switchblade knives, and some municipalities impose blade-length limits on knives that are otherwise unrestricted under state law. Because manual folding knives face almost no state-level restriction, local blade-length rules are where travelers most often run into trouble. Check the local code before carrying in an unfamiliar Maryland city or county.

Penalties

A violation of § 4-101 is a misdemeanor carrying up to three years of imprisonment, a fine of up to $1,000, or both.¹ The same maximum applies to violations of the school-property statute.³ Judges have discretion within that range. A first offender with a clean record may see probation or a fine; someone charged with the knife offense alongside another crime faces stiffer treatment, and a conviction leaves a permanent criminal record that affects employment, licensing, and housing applications.

Defenses

Occupational Use

Maryland recognizes that some jobs require knives. Chefs, butchers, construction workers, and tradespeople routinely carry them as tools. The defense generally requires showing that the knife was tied to the work and that the context made occupational use plausible. A chef traveling home from a restaurant with a knife roll is on stronger ground than someone carrying the same knives into a bar late at night.

Self-Defense Is Not a Carry Defense

Carrying a knife for self-defense is not a lawful purpose under Maryland law. The Anderson court made this explicit: carrying a listed weapon even with no plan to injure anyone, purely to deter attackers, violates § 4-101. “Just in case” is treated as unlawful intent.

Self-defense can still be raised against an assault or battery charge if you actually used the knife against an imminent threat, and the court will examine whether the force was proportional. That defense answers why you used the knife. It doesn’t answer why you were carrying it.

Federal Rules That Reach into Maryland

Switchblades in Interstate Commerce

The Federal Switchblade Act (15 U.S.C. §§ 1241–1245) prohibits the manufacture for introduction into interstate commerce, and the interstate transportation or distribution, of switchblade knives, with penalties of up to $2,000 in fines or five years’ imprisonment.⁴ The act defines a switchblade as any knife whose blade opens automatically by hand pressure on a button, or by gravity or inertia. Exceptions cover military contracts, common carriers shipping in the ordinary course of business, and knives with a bias toward closure that require manual force to open.

Air Travel

TSA rules prohibit knives of any kind in carry-on bags. Knives must go in checked luggage, sheathed or securely wrapped.⁵ This applies regardless of whether the knife is legal in Maryland or at your destination. If you’re flying out of BWI with a folding knife, pack it in a checked bag.

1
Maryland General Assembly. Maryland Criminal Law Code Section 4-101 – Dangerous Weapons
2
Maryland General Assembly. Maryland Code, Criminal Law Article – Section 4-101
3
Maryland General Assembly. Maryland Criminal Law Code Section 4-102 – Deadly Weapons on School Property
4
GovInfo. U.S.C. Title 15 Chapter 29 – Manufacture, Transportation, or Distribution of Switchblade Knives
5
Transportation Security Administration. Knives