The Cal State East Bay Pioneers (also CSU East Bay Pioneers, East Bay Pioneers, and CSUEB Pioneers; formerly Cal State Hayward) are the athletic teams that represent California State University, East Bay, located in Hayward, California, in NCAA Division II intercollegiate sports. The Pioneers compete as members of the California Collegiate Athletic Association for all 15 varsity sports except for women`s water polo, which competes in the Western Water Polo Association.