William Wirt Winegar (1844 – 1916) was a Union Army officer during the American Civil War.

He received the Medal of Honor for gallantry during the Battle of Five Forks fought on April 1, 1865 southwest of Petersburg, Virginia.

The battle was part of the Appomattox Campaign and was a victory for Union forces under Maj. Gen. Philip H. Sheridan over Confederate Maj. Gen. George E. Pickett.

[1] "The President of the United States of America, in the name of Congress, takes pleasure in presenting the Medal of Honor to First Lieutenant (Cavalry) William W. Winegar, United States Army, for extraordinary heroism on 1 April 1865, while serving with Company B, 19th New York Cavalry (1st New York Dragoons), in action at Five Forks, Virginia.

While advancing in front of his company and alone, First Lieutenant Winegar found himself surrounded by the enemy.