Fremont (IPA: fɹimɑnt) is a city in California which was incorporated on January 23, 1956, from the merger of five smaller communities: Centerville, Irvington, Mission San Jose, Niles, and Warm Springs. The area now comprising Fremont and the adjoining cities of Newark and Union City was formerly known as Washington Township. Fremont is located in the southeast area of the San Francisco Bay Area in Alameda County. The city is named after John Charles Frémont, "the Great Pathfinder."

Home to 243,414 people as of 2005 census, Fremont is the fourth most populous city in the Bay Area. Fremont has the largest Afghan population in the United States and hence became a center of media attention when the US attacked Afghanistan in 2001. The diverse city demographics includes many Asian ethnic groups, including Indians, Chinese, Taiwanese, and other Asian groups, concentrated most heavily in the Mission San Jose District.

NUMMI, a joint automobile manufacturing plant for General Motors and Toyota, is located in the Warm Springs district of Fremont.

Actress Julie Pinson was born in Fremont. Olympic skater Kristi Yamaguchi grew up in Fremont as did Baseball Hall of Fame pitcher Dennis Eckersley (Eckersley was a 1972 graduate of Washington High School). Rap star and Christian minister M.C. Hammer, lived in Fremont during his prime as a music legend, during which such hits as "Can't Touch This" and "2 Legit to Quit" were well known. On the other end of Hip Hop's political spectrum, Emcee Lynx grew up in the Irvington district of Fremont.

Fremont is the sister city to Elizabeth, South Australia and Fukaya, Saitama in Japan.