Patrick Shanahan (November 6, 1867 – December 7, 1937) was a United States Navy sailor who received the Medal of Honor.

(Logbook 46 of USS Essex, NA, Washington DC) Shanahan was born in Ireland, emigrated to the United States and enlisted in the U.S. Navy 1892.

In 1899 he was a chief boatswain's mate on the USS Alliance when he rescued another sailor from drowning.

During World War I, he received a temporary promotion to lieutenant on July 1, 1918.

Displaying heroism, Shanahan rescued William Steven, quartermaster, first class, from drowning.