The 205th Pennsylvania Infantry was an infantry regiment of the Union Army during the American Civil War. It was raised during the final war year in response to President Lincoln's call for 500,000 volunteers. The regiment joined the IX Corps to counter General Lee's final offensive thrust at Ford Stedman and attacked to break through the Petersburg defenses one week before his final surrender at Appomattox. It participated in the Grand Review of the Armies and was mustered out in June 1865.