Dr. W. Robert (Bob) Perkins Jr., 61, a general medical practitioner here for nearly 30 years, died Friday in a Vero Beach, Fla., hospital after a heart attack.

He was a 1943 graduate of George Washington University's medical school. He joined his father's Washington medical practice after serving his internship at the old Gallinger Hospital.

Dr. Perkins retired from medicine for reasons of health and moved to Florida in 1976.

He was a native of Washington. He was a graduate of Sidwell Friends School and Princeton University, where has was elected to Phi Beta Kappa.

Dr. Perkins had been president of the D.C. chapter of the American Association of Family Practice. He was a member of the Congressional Country Club and a yacht club in Vero Beach.

His first wife, the former Margaret Lockhart, died in 1976.

Survivors include his second wife, Hilda N., of the home in Vero Beach: two daughers, Marsha Austin, of Hinsdale, III., and Jeanne Theobald, of Glen Ellyn, III.; a son, W. Robert III, of Shaker Heights, Ohio; a sister, Jane Reish, of Mavern, Pa., and seven grandchildren.

The family suggests that expressions of sympahty be in the form of contributions to the Dr. W. R. Perkins Jr. Memorial Fund at Sibley Memorial Hospital.