| Diego Zarzosa | |
| Birth Name: | Diego Zarzosa Peña |
| Birth Date: | 25 December 1975 |
| Birth Place: | Valladolid, Spain |
| Height: | 1.780NaN0 |
| Weight: | 105kg (231lb) |
| Position: | Hooker |
| Repteam2: | Barbarians |
| Repyears1: | 1998–2009 |
| Repyears2: | 2007 |
| Repcaps1: | 46 |
| Repcaps2: | 1 |
| Reppoints1: | 15 |
| Reppoints2: | 5 |
| Ru Ntupdate: | 7 February 2022 |
| Years1: | 1996-2006 |
| Years2: | 2006-2007 |
| Years3: | 2007 |
| Years4: | 2007-2009 |
| Years5: | 2009 |
| Clubs1: | CR El Salvador |
| Clubs2: | CRC Madrid |
| Clubs3: | Harlequins |
| Clubs4: | CR El Salvador |
| Clubs5: | Vacceos Cavaliers |
| Ru Clubupdate: | 2007-11-28 |
Diego Zarzosa Peña (born 25 December 1975 in Valladolid) is a Spanish rugby union hooker who plays for CR El Salvador in the División de Honor.
Zarzosa represented Spain during the 1999 Rugby World Cup.In 2007, Zarzosa signed a six-months contract with English giants Harlequins after Samoan Tani Fuga was called to the World Cup squad and Chris Brooker suffered a shoulder injury. He was not able to debut in the Premiership. Later that year, he became the second Spanish-born rugby player to play for the Barbarians.
Zarzosa holds currently 45 caps for Spain, with 3 tries scored, 15 points in aggregate.