YO! Sushi is a British restaurant chain which was started in 1997 and is owned by Quilvest (lead investor) and the YO! Sushi Senior Management team. YO! Sushi specialises in delivering sushi to customers using the Japanese style 'kaiten' conveyor belt method. In each restaurant various sushi dishes and other Japanese cooked foods are prepared in a kitchen in plain view of customers and then set on the thin conveyor belt. The belt carries food around the restaurant in a circuit, allowing diners to pick any dish from the belt for consumption. In order to indicate freshness, a label is applied to the lid of the dish to indicate when the dish must be consumed by.

The restaurants are mostly based in the United Kingdom with the majority in London. Restaurants have also been opened in the Middle East in Dubai,Saudi Arabia, Bahrain and Kuwait, with others in other countries such as Russia and Ireland. YO! Sushi plans to open restaurants in the United States. The company's headquarters is located on Farringdon Road, London, UK.

Sushi (すし, 寿司, 鮨, 鮓, 寿斗, 寿し, 壽司^?) is a Japanese food consisting of cooked vinegared rice (shari) combined with other ingredients (neta). Neta and forms of sushi presentation vary, but the ingredient which all sushi have in common is shari. The most common neta is seafood.

Raw meat sliced and served by itself is sashimi.

The original type of sushi, known today as nare-zushi (馴れ寿司, 熟寿司), was first developed in Southeast Asia, and spread to south China before introduction to Japan. The term sushi comes from an archaic grammatical form no longer used in other contexts; literally, sushi means "sour-tasting", a reflection of its historic fermented roots. The oldest form of sushi in Japan, narezushi, still very closely resembles this process, wherein fish is fermented via being wrapped in soured fermenting rice. The fish proteins break down via fermentation into its constituent amino acids. The fermenting rice and fish results in a sour taste and also one of the five basic tastes, called umami in Japanese. In Japan, narezushi evolved into oshizushi and ultimately Edomae nigirizushi, which is what the world today knows as "sushi".