The 7th Regiment California Volunteer Infantry was an infantry regiment in the Union Army during the American Civil War. It spent its entire term of service in the western United States, attached to the Department of the Pacific, serving in California and Arizona Territory. They were known as the "Gold Diggers" in reference to the large number of recruits from the California's "Mother Lode" region. Later, they were also called the "Hungry Seventh" for the privations they suffered in Arizona, particularly at Fort Mason. The Regiment included many veterans of the Mexican–American War.