John P. Donnelly (July 24, 1886 – May 4, 1949) was an American lawyer and politician.
Born in Milwaukee, Wisconsin, Donnelly received his bachelor's degree from Marquette University in 1907 and his law degree from Marquette University Law School in 1911.
Donnelly served in the Wisconsin State Assembly from 1915 to 1921 and was involved with the Democratic Party.
Donnelly died in a hospital in Milwaukee, Wisconsin from a heart attack.
This article about a Democratic Party member of the Wisconsin State Assembly is a stub.