1948 United States presidential election in New Hampshire

The 1948 U.S. presidential election in New Hampshire occurred on November 2, 1948, as part of the broader national contest held across all 48 contemporary states. Voters selected four electors for the Electoral College to determine the president and vice president.

In New Hampshire, Republican nominees Thomas E. Dewey and Earl Warren won against Democratic incumbents Harry S. Truman and Alben W. Barkley. Additionally, Progressive Party candidate Henry A. Wallace with Glen H. Taylor participated but secured minimal support. Dewey received 52.41% of the vote, while Truman got 46.66%, resulting in a margin of 5.75%. Wallace only garnered 0.85%.

Dewey won seven counties compared to Truman's three. Despite this, Truman's victories in populous counties like Hillsborough maintained the race's closeness. Hillsborough County, a reliable Democratic bastion since 1928, supported Truman. Conversely, Carroll County, traditionally Republican, voted over 70% for Dewey.

New Hampshire, with its more Republican tilt, became one of Dewey's strongest states, ranking fifth after Vermont, Maine, Nebraska, and Kansas. The state was about ten percentage points more Republican than the national average. Notably, Sullivan County flipped from Democratic to Republican in this election.