The legality of owning a Japanese katana, or any type of sword, depends on the laws and regulations of the specific country, state, or local jurisdiction where you reside. These laws can vary significantly from one place to another.

In some countries, owning a katana may be legal without any restrictions. In other jurisdictions, ownership of certain types of swords, including katana, may be regulated or prohibited. Some countries classify swords as controlled weapons and require licenses, permits, or other authorizations for ownership.

It is crucial to research and understand the laws in your particular jurisdiction to ensure compliance. Consult local law enforcement agencies or legal authorities, or refer to government websites that provide information on weapon regulations. They can provide you with the most accurate and up-to-date information regarding the legal requirements and restrictions for owning a Japanese katana in your area.

Keep in mind that even if it is legal to own a katana, there may still be regulations regarding transportation, display, or sale. It is essential to abide by these regulations to ensure lawful ownership and responsible handling of the sword.