Thomas P. Loughran, Jr. is an American physician-scientist who specializes in cancer research and treatment.

His previous appointments included program leader of hematologic malignancies at the H. Lee Moffitt Cancer Center & Research Institute at the University of South Florida, associate director of the Bone Marrow Transplant Program at SUNY Health Science Center and chief of hematology at the Syracuse Veteran's Affairs Medical Center in Syracuse, New York.

[2] Loughran completed his fellowship in medical oncology in 1985 at the Fred Hutchinson Cancer Research Center in Seattle, Washington under direction of Nobel Laureate E. Donnall Thomas.

[1] Loughran's primary research interest is large granular lymphocyte leukemia (LGL), a hematologic malignancy he discovered in the mid-1980s.

[10] Loughran holds American Board certifications in internal medicine and medical oncology.