The 2005 UC Davis football team represented the University of California, Davis in the 2005 NCAA Division I-AA football season. They competed in the Great West Football Conference (GWFC). The 2005 Aggies were led by head coach Bob Biggs in his thirteenth year and played their home games at Toomey Field. UC Davis finished the season as co-champion of the GWFC, with a record of six wins and five losses (6–5, 4–1 GWFC). This was the 36th consecutive year UC Davis finished with a winning record. The Aggies outscored their opponents 217–184 for the season.