Jean Constant Havez (December 24, 1872 – February 11, 1925) was an American lyricist, screenwriter, and vaudevillian.

His novelty songs, popular in their day, include "Darktown Poker Club" and "I'm Cured", written for the great vaudevillian Bert Williams for the 1914 Ziegfeld Follies; "Everybody Works But Father", "When You Ain't Got No Money then You Needn't Come Around", "I'm Looking For an Angel", "Do Not Forget the Good Old Days", "You're On the Right Road, Sister", "He Cert'ny Was Good to Me" and the lyrics for "Sailing Down the Chesapeake Bay".

Concurrent with his songwriting, Havez wrote vaudeville routines and stage shows for such performers as Reine Davies, Trixie Friganza, Kolb & Dill, and Cecil Cunningham (who was his first wife).

Havez penned Keystone scenarios for Roscoe Arbuckle, among others, and co-wrote several of Keaton's most popular films, including Our Hospitality (1923), Sherlock Jr. (1924), The Navigator (1924), and Seven Chances (1925).

His widow, a vaudevillian turned screenwriter, married director Edward Sedgwick and remained with him until his death in 1953.