Col. Henry J. Ritterbush Jr., a retired executive of International Business Machines Corp., died Sunday ofter a long illness at Anne Arundel General Hospital in Annapolis. He was 62 years old.

Mr. Ritterbush, who was born in New York and was a graduate of New York University, joined IBM in 1940 and enlisted in the army in 1941.

During World War II, he saw service in North Africa, Italy, France and Germany and was awarded the Legion of Merit, the Purple Heart and a commendation medal.

He was awarded the Most Excellent Order of the British Empire for his work with the British government during the war. He rejoined IBM after his military service.

Mr. Ritterbush retired from IBM in 1971 after 31 years with the company. He was IBM's manager of customer education at the time of his retirement.

Mr. Ritterbush was a member of Annapolis Lodge 89, AF and M.; a member of the Fleet Reserve Club, Veterans of Foreign Wars and the Annapolis Yacht Club.

Mr. Ritterbush is survived by his wife, Nancy; two sons, Stephen and Daniel, both of Annapolis; and a daughter, Deacon Ritterbush, also of Annapolis.

The family suggests that expressions of sympathy be made to the intensive care unit, Anne Arundel General Hospital, Annapolis.