Jack Wagner (May 20, 1891 – July 13, 1963) was an American Academy Award nominee screenwriter and cinematographer mostly during the silent era of motion pictures.

He continued working through the teens and 1920s as a gag writer and cameraman for Fox Films and the Hall Room Boys Photoplays.

One of his last cinematography assignments before turning to screenwriting full-time was as a second unit cameraman for Rex Ingram's The Four Horsemen of the Apocalypse.

He also co-wrote the short film La Cucaracha (1934), which garnered RKO Radio Pictures an Academy Award.

Steinbeck had considered Jack's mother, Edith Wagner, as his first writing coach while growing up in Salinas, California.

After much work Steinbeck and Jack wrote the script for Benny and it earned an Academy Award nomination for Best Original Screenplay.