Grace Longwell Coyle (1892–1962) was a highly influential American thinker in the area of social work with groups.

She wrote important books on the subject, and had great influence on the development of teaching group work concepts.

Her brother, David Cushman Coyle (1887–1969) wrote popular books on economics and public policy, and was appointed to Franklin D. Roosevelt's "Brain Trust".

She won a scholarship from the College Settlement Association to attend the New York School of Philanthropy in 1915, where she studied social work and earned a diploma in 1915.

[2] In 1923 she developed one of the first group work courses at the School of Applied Social Sciences of Western Reserve University, Cleveland.

[2] In the summer of 1934 Coyle organized a two-week group work institute for forty YWCA and settlement house workers at Fletcher Farm School in Vermont.

[5] Grace Coyle taught from 1934 to 1962 at the School of Applied Social Sciences in Western Reserve University.

[10] Publications include: The archives of Case Western University hold a collection of her manuscripts, course outlines and correspondence.