The 1990 Cal State Hayward Pioneers football team represented California State University, Hayward in the 1990 NCAA Division II football season. Cal State Hayward competed in the Northern California Athletic Conference (NCAC). The Pioneers were led by head coach Tim Tierney in his 16th year. They played home games at Pioneer Stadium in Hayward, California. The Pioneers finished the season with a record of two wins and nine losses (2–9, 1–4 NCAC). The Pioneers were outscored by their opponents 159–326 for the 1990 season.