Is Butterfly Knife Legal in Missouri? (2026)

Key facts

Status

Legal

Permit required

No

Jurisdiction

Missouri

Last reviewed

2026-02-15

Butterfly Knife laws in Missouri

In Missouri, butterfly knives (also known as balisongs) are generally legal to possess, carry, and sell. There is no specific state statute that prohibits the ownership or carrying of butterfly knives. This classification places them in a similar category to other knives under Missouri law, which does not broadly ban specific types of knives based on their mechanism of opening. However, the legality of carrying a butterfly knife may be subject to specific local ordinances within municipalities, which could impose restrictions not present at the state level. Furthermore, while state law permits possession, the act of carrying a concealed butterfly knife may be subject to different regulations than open carry, depending on the specific circumstances and local laws. While state law permits possession, the transport of butterfly knives may be restricted under certain circumstances, particularly when considering travel through airports or other transportation hubs. The Transportation Security Administration (TSA) explicitly prohibits butterfly knives in carry-on luggage. For residents, while not explicitly prohibited by state statute for general carrying, it is crucial to be aware of potential local restrictions. For instance, a municipality might have an ordinance that regulates the carrying of such knives, potentially classifying them as illegal weapons or dangerous instruments if carried in a way deemed threatening. There are no specific exemptions or recent changes at the state level that broadly alter the legal status of butterfly knives in Missouri. However, as with many weapons laws, age requirements for purchase typically apply, meaning individuals under a certain age may not be legally permitted to buy them. Travelers should be particularly mindful of TSA regulations when flying, as butterfly knives are not permitted in carry-on bags. Residents should also exercise caution and research municipal ordinances in their specific location, as these local rules can significantly impact the legality of openly or concealed carrying a butterfly knife.

Frequently asked questions

Is butterfly knife legal in Missouri for travelers?

For travelers visiting Missouri, butterfly knife is currently legal. In Missouri, butterfly knives (also known as balisongs) are generally legal to possess, carry, and sell. There is no specific state statute that prohibits the ownership or carrying of butterfly knives. This classification places them in a similar category to other knives under Missouri law, which does not broadly ban specific types of knives based on their mechanism of opening. However, the legality of carrying a butterfly knife may be subject to specific local ordinances within municipalities, which could impose restrictions not present at the state level. Furthermore, while state law permits possession, the act of carrying a concealed butterfly knife may be subject to different regulations than open carry, depending on the specific circumstances and local laws. While state law permits possession, the transport of butterfly knives may be restricted under certain circumstances, particularly when considering travel through airports or other transportation hubs. The Transportation Security Administration (TSA) explicitly prohibits butterfly knives in carry-on luggage. For residents, while not explicitly prohibited by state statute for general carrying, it is crucial to be aware of potential local restrictions. For instance, a municipality might have an ordinance that regulates the carrying of such knives, potentially classifying them as illegal weapons or dangerous instruments if carried in a way deemed threatening. There are no specific exemptions or recent changes at the state level that broadly alter the legal status of butterfly knives in Missouri. However, as with many weapons laws, age requirements for purchase typically apply, meaning individuals under a certain age may not be legally permitted to buy them. Travelers should be particularly mindful of TSA regulations when flying, as butterfly knives are not permitted in carry-on bags. Residents should also exercise caution and research municipal ordinances in their specific location, as these local rules can significantly impact the legality of openly or concealed carrying a butterfly knife.

Do I need a permit for butterfly knife in Missouri?

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

Can I transport butterfly knife through Missouri?

Transport laws for butterfly knife in Missouri 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 Missouri?

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