John Gibson McMynn (July 9, 1824 – June 5, 1900) was an American educator and school system administrator.

Born in Palatine Bridge, New York, McMynn graduated from Williams College in 1848.

In 1853, he moved to Racine, Wisconsin,[1] to set up the public school system.

[2] Shortly after his death, McMynn School was established in Racine and named for him.

The school was demolished in 1975 and replaced by an apartment building named McMynn Tower.