Lewis Haines Wentz (November 10, 1877 – June 9, 1949) was an American oil businessman.

Reared in Pittsburgh, Pennsylvania Wentz was too poor for college and started out in 1909 by organizing a semi-professional baseball team, the old Oneida Base Ball Club, that was organized in an effort to build a better team than Barney Dreyfuss’ Pittsburgh Pirates.

McCaskey had made a huge fortune in the sauerkraut business and had recently become an investor and President of the 101 Ranch Oil Company located on the Miller Brothers 101 Ranch property in Ponca City, Oklahoma.

Through his association with the 101 Ranch Oil Company Wentz became interested in the oil business and in a few years, with money provided by McCaskey and another partner, Joseph M. Weaver, Wentz began gathering lease land in Northwest Kay County and soon the McCaskey-Wentz Company was developed.

Early strikes were at the Mervien Oil Field east of Kildare, and the Three Sands area near Tonkawa.

When Wentz sold his oil interests just before the 1929 crash he increased his support for higher education at these colleges.