Tsuyoshi Yamanaka

was a Japanese freestyle swimmer. He competed in the 400 m, 1500 m and 4 × 200 m events at the 1956, 1960 and 1964 Olympics and won four silver medals; he also helped Japan win a bronze relay medal in 1964 by swimming in the heat, and placed fourth in the 4 × 200 m relay in 1956 and in the 1500m in 1960. At the 1960 Olympics, he swam the fastest leg in the 4 × 200 m relay, yet his team lost to the United States. Yamanaka won the 400 m and 1500 m events at the 1958 Asian Games.