| Leif Nielsen | |
| Fullname: | Leif Bernhard Nielsen |
| Birth Date: | 28 May 1942 |
| Birth Place: | Copenhagen, Denmark |
| Position: | Goalkeeper |
| Years1: | 1961–1967 |
| Years2: | 1968 |
| Years3: | 1969–1971 |
| Clubs3: | Greenock Morton |
| Caps1: | 164 |
| Caps2: | 30 |
| Caps3: | 54 |
| Goals1: | 0 |
| Goals2: | 0 |
| Goals3: | 0 |
| Totalcaps: | 248 |
| Totalgoals: | 0 |
| Manageryears2: | 1978–1979 |
| Managerclubs1: | Hero |
| Managerclubs2: | Brønshøj |
| Nationalyears1: | 1960 |
| Nationalyears2: | 1963 |
| Nationalyears3: | 1964–1967 |
| Nationalteam3: | Denmark |
| Nationalcaps1: | 2 |
| Nationalcaps2: | 1[1] |
| Nationalcaps3: | 28 |
| Nationalgoals1: | 0 |
| Nationalgoals2: | 0 |
| Nationalgoals3: | 0 |
Leif Bernhard Nielsen (born 28 May 1942) is a Danish former football goalkeeper, who was named the 1966 Danish Player of the Year. He played 28 games for the Denmark national football team,[1] and participated in the 1964 European Championship. He played for BK Frem in Denmark. In 1968, he played for the Houston Stars of the North American Soccer League before finishing his career with Scottish club Greenock Morton.