Preston Marvin Bauman, 63, an authority on tropical diseases, and a former resident of the Washington area, died Tuesday at his home in Lake Forest, Ill., apparently after suffering a heart attack.

Born in Rosslyn, Va., he grew up in this area. In 1942, while a student at George Washington University, he enlisted in the Army and was assigned to the medical corps, where he received training on parasitic diseases in man and domestic animals.

In 1945, Mr. Bauman was assigned to a special commission, which was sent to the Philippines to set up measures to protect American troops there from schistosomiasis. He received the Bronze Medal for his contribution to this effort.

After the war, Mr. Bauman worked as a civilian on parasitic diseases at Walter Reed Army Medical Center.

He left here in 1957 to join the research division of Abbott Laboratories in Chicago, where he remained until retiring in 1973.

Mr. Bauman was credited with making many scientific contributions toward the discovery and isolation of parasites causing various diseases. He belonged to a number of scientific organizations in this field.

He is survived by three sisters, Ruby B. Collins and Dorothy M. Winslow, both of Silver Spring, and Madeline Hamel, of Bowie, and a brother, Albert B. Bauman Jr., of New Hyde Park, Long Island.

The family suggests that expressions of sympathy be in the form of contributions to the American Society of Tropical Medicine in Cincinnati.