Wilbur Mack (July 29, 1873 - March 13, 1964) was an American film actor and early vaudeville performer from the 1920's through the 1960's. His film acting career began during the silent film era.

Mack was born and raised in Binghampton, New York, and married fellow vaudeville performer and later actress Constance Purdy, forming the husband and wife vaudeville team, "Mack and Purdy". He and Purdy divorced not far into the marriage, and he married vaudeville performer and also future actress Nella Walker. The couple saw considerable success in their vaudeville act, and in 1925 Mack entered into a film acting career. His first film appearance was Gold and Grit, alongside Buddy Roosevelt and Ann McKay. He would appear in twenty films from 1925 to 1929, and his wife entered into her own film acting career in 1929.

Mack made a smooth transition to "talking films", and in 1930 appeared in thirteen films. He and Walker divorced not long after the start of her career, but she saw ongoing success as a supporting and minor role actress, whereas he would continually have film appearances, but with limited success. From 1931 through 1933 Mack would appear in twenty four films. From 1934 until the end of the 1930's era in 1939, Mack would appear in fifty five films. However, as successful as that sounds, forty five of those appearances were uncredited. His most notable credited roles during that period was Million Dollar Baby alongside Ray Walker and Arline Judge, in 1934, and the 1936 crime drama The Crime Patrol, also alongside Ray Walker.

His career in the 1940's decade was similar to his career up until that point, with him continuing to appear often in films, but mostly in uncredited roles. Mack appeared in seventy six films from 1940 to 1949, of which only seven were credited roles. He would continue to appear in both films and television throughout the 1950's and into 1962, with his last appearance being an uncredited role in the 1962 movie Who's Got the Action?, starring Dean Martin, Lana Turner, Eddie Albert and Walter Matthau. He was living in Hollywood when he died on March 13th, 1964.

Gaunt, hollow-eyed character actor who spent his first thirty years in show business as a vaudeville headliner. With his first wife Constance Purdy he formed the team of "Mack and Purdy," and with second wife Nella Walker he trod the boards as "Mack and Walker."

In films from 1925 to 1964, he appeared in hundreds of atmospheric bits and extra roles, usually playing doormen, businessman, reporter or cop somewhere in the background.