Hugh Roy Cullen (July 3, 1881 – July 4, 1957) was an American industrialist and philanthropist. Cullen was heavily involved in the petroleum industry having struck oil near Texas in 1928. He was a large supporter of multiple educational institutions in and around Houston, in one of which, the University of Houston, he became a longtime chairman of the board of regents. He is considered one of the most important figures in Texas during the "oil boom" era.