Tetsuya Ayukawa (鮎川 哲也 Ayukawa Tetsuya, February 14, 1919 - September 24, 2002) was a Japanese critic and novelist. He is noted for his Detective Onikawa Series of mystery stories.
Ayukawa was born in Tokyo, Japan, but spent his youth in Dalian, China, when it was Japan's leased territory. His first mystery was The Petrov Case about a rich Russian émigré's death in Dalian, which won him a Naoki Prize in 1950.