One Japanese sword that is longer than a standard katana is the Ōdachi. The Ōdachi, also known as nodachi, is an extra-long sword with a blade length typically exceeding 90 centimeters (around 35 inches). Some Ōdachis can have blades as long as 120 centimeters (approximately 47 inches) or even longer.

The Ōdachi is characterized by its extended length, which makes it difficult to handle with one hand. It was historically used by samurai warriors on foot or occasionally by soldiers fighting from horseback. Due to its size and weight, the Ōdachi was primarily employed in open-field battles or specific combat scenarios that allowed for its effective use.

The longer blade of the Ōdachi provided increased reach and cutting power, making it suitable for engaging multiple opponents or disrupting enemy formations. However, the Ōdachi was less commonly encountered than the katana and was more specialized in its application.

It's worth noting that the Ōdachi is considered a distinct type of sword, and its usage and design are separate from the katana. The katana, with its curved, single-edged blade and shorter length, remains the more widely recognized and commonly encountered Japanese sword.