John Leonard Hopp (Cotney) (July 18, 1916 – June 1, 2003) was a Major League Baseball outfielder and first baseman. He was an All-Star in 1946.
Hopp was born in Hastings, Nebraska. Signed by the St. Louis Cardinals as an amateur free agent in 1936, Hopp made his Major League Baseball debut with the St. Louis Cardinals on September 18, 1939, and appeared in his final game on September 27, 1952.
He died, aged 86, in Scottsbluff, Nebraska.
The book Carl Erskine's Tales from the Dodgers Dugout: Extra Innings (2004) includes short stories from former Dodger pitcher Carl Erskine. Hopp is featured in a number of these stories.