Is Butterfly Knife Legal in Massachusetts? (2026)

Key facts

Status

Restricted

Permit required

No

Jurisdiction

Massachusetts

Last reviewed

2026-04-09

Butterfly Knife laws in Massachusetts

In Massachusetts, butterfly knives, also known as balisongs, are subject to specific regulations. While there isn't a statute that explicitly names "butterfly knives," they can fall under the broader category of "gravity knives" or "switchblade knives," which are generally prohibited for sale, possession, and distribution under Massachusetts General Laws Chapter 269, Section 10. This statute prohibits the sale, carrying, or possession of any knife with a blade that opens automatically by spring or other mechanical device. The classification of a butterfly knife often depends on how it is constructed and whether it can be opened by means of a spring or mechanical device, even if manual manipulation is primarily involved. Violations of Massachusetts General Laws Chapter 269, Section 10 concerning prohibited knives can result in significant penalties. Carrying a prohibited knife, including a butterfly knife if classified as such, can be a misdemeanor offense, punishable by a fine of up to $100, imprisonment for up to one year, or both. Possession of such a weapon in certain locations, such as schools, can lead to more severe penalties. It is crucial for individuals to understand that the legal interpretation and enforcement of these laws can vary, and consulting with legal counsel is advisable for specific situations. While Massachusetts law broadly restricts the possession of certain types of knives, there are often nuances and potential exceptions. For instance, the law primarily focuses on automatic opening mechanisms. Therefore, a butterfly knife that *cannot* be opened by a spring or other mechanical device, and is *only* opened by manual manipulation, might not strictly fall under the prohibited categories, though this interpretation is subject to legal scrutiny. Furthermore, the law often makes distinctions between carrying a weapon openly versus concealed. Openly carrying a knife that might otherwise be restricted may have different legal implications than carrying it concealed, although such distinctions can be complex and vary by local ordinances. Travelers should be aware that while state laws govern possession, the Transportation Security Administration (TSA) prohibits butterfly knives in carry-on luggage at all airports. For residents and travelers in Massachusetts, understanding the restricted nature of butterfly knives is paramount. It is strongly recommended to research local municipal ordinances, as some cities and towns may have stricter regulations than the state statutes. Due to the potential for butterfly knives to be classified alongside prohibited automatic knives, it is generally advisable for individuals to avoid carrying them within the Commonwealth. If transporting a butterfly knife, one should err on the side of caution and ensure it is not readily accessible and is in compliance with all applicable federal, state, and local laws, especially when traveling through airports.

Frequently asked questions

Is butterfly knife legal in Massachusetts for travelers?

For travelers visiting Massachusetts, butterfly knife is currently restricted. In Massachusetts, butterfly knives, also known as balisongs, are subject to specific regulations. While there isn't a statute that explicitly names "butterfly knives," they can fall under the broader category of "gravity knives" or "switchblade knives," which are generally prohibited for sale, possession, and distribution under Massachusetts General Laws Chapter 269, Section 10. This statute prohibits the sale, carrying, or possession of any knife with a blade that opens automatically by spring or other mechanical device. The classification of a butterfly knife often depends on how it is constructed and whether it can be opened by means of a spring or mechanical device, even if manual manipulation is primarily involved. Violations of Massachusetts General Laws Chapter 269, Section 10 concerning prohibited knives can result in significant penalties. Carrying a prohibited knife, including a butterfly knife if classified as such, can be a misdemeanor offense, punishable by a fine of up to $100, imprisonment for up to one year, or both. Possession of such a weapon in certain locations, such as schools, can lead to more severe penalties. It is crucial for individuals to understand that the legal interpretation and enforcement of these laws can vary, and consulting with legal counsel is advisable for specific situations. While Massachusetts law broadly restricts the possession of certain types of knives, there are often nuances and potential exceptions. For instance, the law primarily focuses on automatic opening mechanisms. Therefore, a butterfly knife that *cannot* be opened by a spring or other mechanical device, and is *only* opened by manual manipulation, might not strictly fall under the prohibited categories, though this interpretation is subject to legal scrutiny. Furthermore, the law often makes distinctions between carrying a weapon openly versus concealed. Openly carrying a knife that might otherwise be restricted may have different legal implications than carrying it concealed, although such distinctions can be complex and vary by local ordinances. Travelers should be aware that while state laws govern possession, the Transportation Security Administration (TSA) prohibits butterfly knives in carry-on luggage at all airports. For residents and travelers in Massachusetts, understanding the restricted nature of butterfly knives is paramount. It is strongly recommended to research local municipal ordinances, as some cities and towns may have stricter regulations than the state statutes. Due to the potential for butterfly knives to be classified alongside prohibited automatic knives, it is generally advisable for individuals to avoid carrying them within the Commonwealth. If transporting a butterfly knife, one should err on the side of caution and ensure it is not readily accessible and is in compliance with all applicable federal, state, and local laws, especially when traveling through airports.

Do I need a permit for butterfly knife in Massachusetts?

Massachusetts does not specifically require a permit for butterfly knife, though general regulations apply.

Can I transport butterfly knife through Massachusetts?

Transport laws for butterfly knife in Massachusetts depend on the specific item and your route. Generally, transport is allowed if you comply with state regulations. Always check states you pass through.

What are the penalties for butterfly knife violations in Massachusetts?

Penalties for butterfly knife violations in Massachusetts vary based on the specific offense. Always verify current laws before traveling.