USS Tacoma (C-18/PG-32/CL-20) was a Denver-class protected cruiser in the United States Navy during World War I. She was the second Navy ship named after the city of Tacoma, Washington.

The Denver-class cruisers were a group of six protected cruisers in service with the United States Navy from 1903 through 1929. Authorized by Congress in 1899 as part of the naval buildup touched off by the Spanish–American War, they were designed with peacetime duties on foreign stations and tropical service in mind, specifically patrolling Latin America and the Caribbean. However, they had insufficient armament, armor, and speed for combat with most other cruisers. Thus, they were also called "peace cruisers" and were effectively gunboats. They were intended to augment the Montgomery class in these roles.