Louis De Pui "Bucker" Vail (September 18, 1870 – December 16, 1948) was an American football player and coach. Vail played football and graduated from Germantown Academy.[1] He attended the University of Pennsylvania, receiving both his A.B. and his LL.B.[2] He was a member of Delta Phi Fraternity. Vail played football at Penn as a quarterback from 1889 to 1893.[3] Vail also played baseball at Penn in 1891 and 1892.[4]