USS Niagara (SP-263) was a vessel of the United States Navy during World War I. Niagara, a yacht built in 1915 by E. A. Fonda of Miami, Florida, was purchased by the United States Navy on 5 July 1917 from General H. M. Creel, of Miami, and was designated USS Niagara (SP-263).

The navy redesignated the boat as SP-263 on 11 April 1918, dropping the name Niagara.

Poinsettia was decommissioned on 21 April 1922 at the Philadelphia Navy Yard and was sold.

This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.

This article about a specific ship or boat of the United States Armed Forces is a stub.