John Haines Ware III (August 29, 1908 – July 29, 1997) was an American politician who served as a Republican member of the U.S. House of Representatives for Pennsylvania's 9th congressional district from 1970 to 1973 and Pennsylvania's 5th congressional district from 1973 to 1975.

He founded the Penn Fuel Gas Company and served as its president for 45 years.

He was elected simultaneously as a Republican to the 91st and to the 92nd Congress by special election to fill the vacancy caused by the death of George Watkins, and was reelected to the 93rd Congress, (November 3, 1970 – January 3, 1975); He was not a candidate for reelection in 1974.

The middle college house in the Quadrangle Dormitories at the University of Pennsylvania is named in his honor.

[3] On May 31, 2002, the U.S. Route 1 freeway in Chester County between the Maryland border and Kennett Square was designated the John H. Ware III Memorial Highway in honor of Ware, who pushed for the construction of the US 1 freeway in Chester County.