John Bernard Ryan (November 12, 1868 – August 21, 1952) was a Major League Baseball catcher.

He is one of only 31 players in baseball history to date to have appeared in Major League games in four decades.

Ryan was born in Haverhill, Massachusetts to Irish immigrants.

He played baseball from an early age and began playing professionally by age 18.

This biographical article relating to a United States baseball catcher born in the 1860s is a stub.