The California Diamond Jubilee half dollar was a United States commemorative silver fifty-cent piece struck at the San Francisco Mint in 1925. It was issued to celebrate the 75th anniversary of California statehood.

The half dollar, sometimes referred to as the half for short or 50-cent piece, is a United States coin worth 50 cents, or one half of a dollar. In both size and weight, it is the largest United States circulating coin currently produced, being 1.205 inches in diameter and 0.085 in (2.16 mm) in thickness, and is twice the weight of the quarter. The coin's design has undergone a number of changes throughout its history. Since 1964, the half dollar depicts the profile of President John F. Kennedy on the obverse and the seal of the president of the United States on the reverse.