1845 United States Senate special elections in Shasta

The 1845 United States Senate special elections in Shasta were held during December 1845. On the class 1 seat National Federalist candidate and future president George P. Hamilton was elected over Republican Unionist William Morris Stewart and general Henry Halleck. On the Class 2 seat Republican Unionist candidate John C. Frémont defeated National Federalist Edward Dickinson Baker, and general Henry Halleck.

At the time, Shasta elected United States senators by a majority vote of each separate house of the Shasta State Assembly, the House and the Senate.

This elections were part of the 1844 and 1845 United States Senate elections