Louis J. Weinig, 75, a retired salesman and bakery sales manager who had been active in business organizations here, died Dec. 10 at the Veterans Administration Medical Center in Washington after a heart attack. He was under treatment for cancer.

Mr. Weinig came to the Washington area in the mid-1930s. He worked as a salesman for the Bond and Smith bakeries, was sales manager for the Colonial and Crusty bakeries, and later was on the sales staff of the Macke Co., where he retired in 1968.

During his business career, he had served as a treasurer of the Washington Purveyors Club, a sales organization, and later as president of the Northeast Businessmen's Association and the Washington Federation of Businessmen.

Mr. Weinig was born in Tiffin, Ohio. He served in the Navy from 1924 to 1928.

A resident of Silver Spring, he had been a member of the Silver Spring Lions Club for more than 25 years and was a leader in its activities supporting the Washington School for Blind Children. He had been a Mason for 50 years.

Survivors include his wife of 43 years, the former Maurille Insley, of Silver Spring, and a sister, Katherine Morgan of Bowling Green, Ohio.

The family suggests that expressions of sympathy be in the form of contributions to the Lions Club or the American Cancer Society.