Richard H. Cosgriff, Sr., (December 15, 1845 – November 2, 1910) was a Union Army soldier in the American Civil War and a recipient of the United States military's highest decoration, the Medal of Honor. An Irish immigrant, his family eventually settled in Wisconsin, where he would spend most of the rest of his life. Enlisting in an Iowa cavalry regiment, he was awarded the Medal of Honor for capturing a Confederate battle flag during an engagement in the last month of the war. After returning to Wisconsin, he worked as a businessman in the lumber and printing industries until his death at age 64.