Aminishiki Ryūji (born October 3, 1978 as Ryūji Suginomori) is a Japanese sumo wrestler. He made his professional debut in 1997 and has been ranked in the top division since 2000. He has earned ten special prizes and won seven gold stars for defeating yokozuna during his career. He has twice been runner-up in a tournament. The highest rank he has reached is sekiwake. He is the younger brother of Asōfuji.
Aminishiki was born in Fukaura, Nishitsugaru District, Aomori Prefecture. He joined Ajigawa stable, run by former yokozuna Asahifuji. He made his professional debut in January 1997. He reached the second highest jūryō division after three years in January 2000. He made the top makuuchi division just three tournaments later in July 2000. He won his first special prize in his debut top division tournament, for Fighting Spirit. In January 2003, he scored his first win over a yokozuna by defeating Takanohana, who announced his retirement the next day. He was a runner-up in the May 2003 tournament. In 2004, he briefly fell to jūryō after suffering an injury in the July tournament.