No, a katana is not considered a sabre. While both the katana and sabre are types of swords, they have distinct characteristics and historical associations.

A katana is a traditional Japanese sword characterized by its curved, single-edged blade, circular or squared guard (tsuba), and a long grip (tsuka) that can accommodate two hands. It is primarily associated with the samurai warriors of feudal Japan and is renowned for its cutting ability.

On the other hand, a sabre is a type of sword with a curved blade and a single cutting edge, typically associated with cavalry warfare. Sabres have a long history and have been used by various cultures and military forces worldwide. The design of a sabre is optimized for slashing and cutting attacks from horseback.

While both the katana and sabre possess curved blades and are effective cutting weapons, their historical origins, cultural contexts, and design features differ significantly. The katana is specifically associated with Japanese samurai culture, while the sabre has a broader global presence and association with cavalry warfare.

Therefore, while there may be some superficial similarities between a katana and a sabre, they are distinct types of swords with unique characteristics and historical backgrounds.