The need for a license to own a samurai sword depends on the specific laws of the jurisdiction in which you live.

• In the United States, there are generally no federal laws that require a license to own a samurai sword. However, state and local laws can vary, so it's always a good idea to check the specific regulations in your area.
• In the United Kingdom, it is generally legal to own a samurai sword, however, certain types of swords are banned. Swords with a curved blade of 50cm or more (such as a samurai sword) have been banned from sale, hire or gift since August 2008, but there are some exceptions for handmade swords, antique swords, or swords made for religious, martial arts, or re-enactment purposes.
• In Japan, traditionally made samurai swords, or nihonto, are considered national treasures, and owning one requires special permission from the government. These swords must also be registered with the local Board of Education.
• In Australia, laws can vary between states, but generally, you are allowed to own a sword if it is used for purposes such as display, collection, historical re-enactments, or martial arts training. However, some states may require you to have a license or permit.