| Diego Vallejo | |
| Birth Date: | 13 February 1973 |
| Birth Place: | Meira, Lugo, Spain |
| Nationality: |  Spanish |
| Years: | 1993, 1995–1996, 1999–2002, 2008, 2010–2012, 2021–present |
| Teams: | Citroën |
| Races: | 36 |
| Championships: | 0 |
| Wins: | 0 |
| Podiums: | 3 |
| Stagewins: | 15 |
| First Race: | 1993 Rally Catalunya |
| Last Race: | 2022 Rally Estonia |
Diego Vallejo Folgueira (born 13 February 1973) is a Spanish rally co-driver. He won the Spanish Rally Championship with his brother Sergio Vallejo twice, in 2009 and 2014. In 2010 he co-drove with Dani Sordo for the Citroën World Rally Team, in five rallies. He also co-drove for the privateer Albert Llovera in 2010, as well in 2011 and 2012.
| Season | Driver | Car | 1 | 2 | 3 | 4 | 5 | 6 | Pos. | Points |
|---|---|---|---|---|---|---|---|---|---|---|
| 2008 | Albert Llovera | Fiat Grande Punto S2000 | ESP Ret | – | 0 | |||||
| 2010 | Dani Sordo | Citroën C4 WRC | GER 2 | JAP 4 | FRA 2 | ESP 3 | GBR 5 | 8º[1] | 73 | |
| 2011 | Albert Llovera | Fiat Grande Punto S2000 | JOR 17 | ITA Ret | GRE 24 | FIN Ret | FRA DNS | ESP 40 | – | 0 |
| 2002 | Ramon Ferreyros | Mitsubitshi Lancer Evo VII | COR 17 | CHI Ret | ARG 10 | FIN Ret | ||||
| 2001 | Sergio Vallejo | Fiat Punto S1600 | ESP Des | GRE Ret | FIN Ret | SRM 22 | COR 19 | GBR Ret | – | 0 |
| 2000 | Manuel Muniente | Mitsubishi Lancer Evolution | ESP Ret | POR Ret | ||||||
| Ramón Ferreyros | Mitsubishi Lancer Evolution | COR 22 | GBR 21 | |||||||
| 1999 | Manuel Muniente | Peugeot 106 | GBR Ret | |||||||
| Peugeot 306 Maxi | GBR Ret | |||||||||
| Mitsubishi Carisma GT | FIN 35 | |||||||||