Seiichiro Sasaki

Seiichiro Sasaki (佐々木 精一郎) is a Japanese long-distance runner. He competed in the marathon at the 1968 Summer Olympics.

Sasaki achieved a personal best in the marathon of 2:11:17, set in the 1967 Fukuoka Marathon, finishing second behind Derek Clayton, who ran 2:09:36.4, a world record for the marathon distance at that time. Sasaki's performance in this marathon was the second fastest in history up to that time.