Laura Bryn Winslow, 77, an area resident since 1910 who was active in volunteer and social organizations, died of cancer Saturday at her home in Chevy Chase.

She had served on the ladies board of the old Garfield Hospital and the women's auxiliary of the Washington Hospital Center. She had been a member of the Junior League, the Garden Club of Chevy Chase and the Sulgrave and Chevy Chase clubs.

Mrs. Winslow was a native of Norway. Her father, Helmer Halvorsen Bryn, was a Norwegian diplomat. In her youth, Mrs. Winslow accompanied her father to assignments in Stockholm and Paris, and, in 1910, to Washington. She was a 1922 graduate of the Holton Arms School.

She won the annual diplomatic tennis tournament here three times. She also bowled and fished.

Mrs. Winslow studied oil painting in the late 1940s. she also worked in ceramics, shell jewelry and glass.

Her husband of 21 years, Francis Winslow, died in 1948. Mrs. Winslow's survivors include three daughters, Laura Winslow of Chevy Chase, Catherine W. Priest of New York City and Mary W. Sisson of Paris; a brother, Sigmund G. Bryn of Rehoboth Beach, Del., and seven grandchildren.

The family suggests that expressions of sympathy be in the form of contributions to the American Cancer Society or to the Rehoboth, Del., Art League