California Steam Navigation Company was a California steamship company formed by a group of steamship captains in 1854.
They competed for control of the traffic in the inland waters of the state, and in coastal traffic along the coast of California, Oregon, and British Columbia. Over the next decade, the company established a monopoly on inland water travel in California.
On March 31, 1871, the California Pacific Railroad Company acquired all property of the California Steam Navigation Company. Five months later, the Central Pacific Railroad, acquired the California Pacific Railroad Company, which continued the operation of the steamboats of the former California Steam Navigation Company.