Olga H. Grinnell, a 65-year resident of the Washington area, and a former aide to a Congressman and a Senator died Tuesday at Saddleback Hospital, Laguna Hills, Calif. She was 93 years old.

Mrs. Grinnell a native of Hudson, Wis., served for 16 years as secretary to Rep. James A. Frear (R-Wis.) and later served as a legislative aide to Sen. Harley M. Kilgore (D-W. Va.)

Before coming to Washington, Mrs. Grinnell taught for four years at a business college in Denver, Colo.

She was an active member and an officer to the Chevy Chase Woman's Club, which she joined in 1936. Among the offices she held in the club were the posts of membership chairman, corresponding secretary and second vice president.

Mrs. Grinnell was very active in the Christian Endeavor organization at Vermont Avenue Christian Church serving in various capacities in the Presbyterial and Synodical Associations, teaching Sunday School at Chevy Chase Presbyterian Church and acting as president of the Missionary Society. She was a member of Chevy Chase Presbyterian for 50 years.

She also served as President of the Ladies of Camelot.

In October, 1975, Mrs. Grinnell, associate member of the Laguna Beach Community Church.

Survivors include a daughter, Mrs. H. Thomas Wilson, of Pasadena, Calif.