Dr. Daniel Prager, 59, a psychiatrist and psychoanalyst, died of cancer Wednesday at his Washington home.

Dr. Prager had a private psychiatric practice here for nearly 30 years. he was an assistant clinical professor of psychiatry at George Washington University from 1961 to 1966, and a teaching analyst at the Washington Psychoanalytic Institute.

He was born in Brooklyn, N.Y., and earned a bachelor's degree in psychology from the City College of New York in 1939, where he was elected to Phi Beta Kappa. In 1940, he earned a master's degree in psychology from the University of Iowa, and in 1946, a medical degree from New York Medical College.

Dr. Prager served his internship and residency at St. Elizabeths Hospital from 1947 to 1950, and trained as a psychoanalyst at the Washington Psychoanalytic Institute from 1947 to 1957.

He was a member of the American Psychological Society, the Washington Psychoanalytic Society, the American Psychoanalytic Association and the Medical Society of the District of Columbia. He also was a fellow of the American Psychiatric Association.

Survivors include his wife, Effie Mae McCay Prager, a son, David, and a daughter, Cathy, all of the home; his mother, Mollie Prager, of Miami Beach, Fla., and a sister, Doris Weisen, of Long Island, N.Y.