Gerald Roy (Kelly) Cullins, 62, a former account executive for several Washington advertising agencies, died Sunday at his home in Hollywood, Fla. He had suffered from a heart ailment.

Before his retirement in 1970 because of ill health, he had handled the advertising for a number of major special events here, including the annual show and boat, travel sports and vacation shows held at the D.C. Armory.

Mr. Cullins was born in Muskingdum County, Ohio. He served in the Coast Guard in World War II and came to Washington in the late 1940s.

He was district manager and sales representative for the Universal C.I.T. Corp. until 1951, when he went into advertising. He then was associated with the Larrabee Advertising Agency and the Ernest S. Johnson Advertising Agency.

Mr. Cullins had been chairman of the aviation committee of the Metropolitan Washington Board of Trade and of the Dulles Development Commission for the airport. He was a former director of the Munsey Trust Co. and National Association of Travel Organizations.

Before moving to Florida, he and his wife, Bliss Harris Cullins, divided their time between their Washington home and a farm in Loudoun County.

In addition to his wife, he is survived by a daughter, Priscilla, both of the home in Hollywood.