Frederick D. Wilhelmsen (1923 – 21 May 1996) was a distinguished Roman Catholic philosopher, noted, both as a professor and as a writer, for his explication and advancement of the Thomistic tradition. He also was a political commentator, assessing American politics and society from a traditionalist perspective and a political thinker, addressing what he perceived to be the failings of secular-liberal democracy. He principally was a professor at the University of Dallas from 1965 to his death in 1996. He also taught at the University of Santa Clara, the Al-Hikma University in Baghdad, the University of Navarra in Pamplona, Spain, and lectured and taught classes at many other universities.