| Medal record | ||
|---|---|---|
| Men's swimming | ||
Representing  Denmark
| ||
| Olympic Games | ||
 |
1988 Seoul | 200 m butterfly |
| World Championships (LC) | ||
 |
1986 Madrid | 200 m butterfly |
| European Championships (LC) | ||
|
1985 Sofia | 200 m butterfly |
|
1987 Strasbourg | 200 m butterfly |
|
1987 Strasbourg | 100 m butterfly |
Benny Leo Nielsen (born 26 March 1966 in Aalborg, Nordjylland) is a former butterfly and freestyle swimmer from Denmark, who won the silver medal in the 200 m butterfly at the 1988 Summer Olympics in Seoul, South Korea.