Carl Rudolf "Rudy" Berghult II (April 15, 1905 – February 16, 2000) was an American politician who served as the 26th mayor of Duluth, Minnesota from 1937 to 1941.

Berghult was credited with secured government funding for the Blatnik Bridge and working to beautify the city's public land as mayor, in addition to revising the city's debt structure and beginning several health and work programs for its citizens.

Berghult was preceded by Samuel F. Snively and succeeded by Edward H. Hatch.

Following his tenure as mayor, Berghult joined the United States Navy, earning recognition for his service at Normandy Beach and in Norway.

Berghult was cremated; his ashes were interred at Oneota Cemetery, located in Duluth.