| Sergei Losev | |
| Fullname: | Sergei Vladimirovich Losev |
| Birth Date: | 31 July 1983 |
| Birth Place: | Leningrad, Soviet Union |
| Position: | Goalkeeper |
| Youthclubs1: | DYuSSh Smena-Zenit |
| Years1: | 2001–2003 |
| Caps1: | 0 |
| Goals1: | 0 |
| Years2: | 2004–2005 |
| Clubs2: | FC Tom Tomsk |
| Caps2: | 1 |
| Goals2: | 0 |
| Years3: | 2006–2007 |
| Caps3: | 1 |
| Goals3: | 0 |
| Years4: | 2008 |
| Caps4: | 14 |
| Goals4: | 0 |
| Years5: | 2010–2015 |
| Caps5: | 129 |
| Goals5: | 0 |
| Nationalyears1: | 2005 |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
Sergei Vladimirovich Losev (Russian: Серге́й Владимирович Лосев; born 31 July 1983) is a Russian former professional football player.
He made his debut for FC Zenit St. Petersburg on 20 August 2003 in the Russian Premier League Cup semifinal against FC Torpedo Moscow, substituting Vyacheslav Malafeev in added time. Zenit eventually won that cup.
He played 5 seasons in the Russian Football National League for 4 different clubs.