USS Niagara (SP-263), was a yacht built in 1915 and acquired by the US Navy in 1917 serving until 1922. She was later transferred to the US Coast Guard, reclassified as a USLHT, and renamed Poinsettia.
USS Niagara (SP-136), was a yacht, built in 1898 and acquired by the US Navy in 1917 and converted into an armed patrol yacht. She was reclassified "PY-9" in 1920, and finally struck from the Naval Vessel Register in 1931.
USS Niagara (PG-52), was a yacht built in 1929 as Hi-Esmaro. Acquired by the Navy in 1940 and sunk in battle on 22 May 1943
This article includes a list of ships with the same or similar names. If an internal link for a specific ship led you here, you may wish to change the link to point directly to the intended ship article, if one exists.