USS Pennsylvania R. R. No. 9 (SP-679)
 USS Pennsylvania R. R. No. 9 (SP-679) also known as USS Penn R. R. No. 9 (SP-679) and USS P.R.R. No. 9 (SP-679) was a United States Navy armed tug and minesweeper in commission from 1917 to 1919.Pennsylvania R. R. No. 9 was built as a commercial tug of the same name by William R. Trigg at Richmond Virginia in 1904. She also was listed as Penn R. R. No. 9 and P.R.R. No. 9. In September 1917 the U.S. Navy acquired her from her owner the Pennsylvania Railroad for use during World War I.