C. Frances Yoder Shryock, 56 who was active in church in church organizations and the Maryland Right-to-Life Movement, died Friday at Bethesda Naval Hospital after a heart attack.

Mrs. Shryock, who was born in Prince George's County, was a lifelong resident of the Washington area. She attended Hyattsville High School and lived in Lanham at the time of her death.

She was a member of the Saint Mathias Catholic Church in Seabrook and of its Sodality. She also was a member of the CANA conference, a church group.

Survivors include her husband of 34 years, Charles Malone Shryock Jr. of Lanham; five sone, Charles M. Iii, of Severn, Md., Douglas A., of Lanham, Steven G., of Charlotte Hall, Md., Michael B., of Annapolis, and John M., of Lamham; seven daughters, Mary T. Brady of Annapolis, Susan K. Klosek of Glen Dale, Frances Ann Hesson of Bowie, Catherine A. Shryock of Bowie, and Martina E., Clare M., and Bernadette V. Shryock, all of Lanham; three sisters, Ellen M. Richardson of College Park, Marie Sutphin of Helen Estates, Md., and Laura Alice Pfeiffer of Elkhart, Ind., and 16 grandchildren.

The family suggests that expresions of sympathy be in the form of contributions to the Maryland Right-to-Life Movement.