Artemus Ward "Nick" Allen (September 14, 1888 – October 16, 1939) was an American catcher in Major League Baseball.

Allen became a minor league baseball manager after his playing career was over and earned the nickname "Roarin' Nick" for his altercations with umpires.

The Cincinnati Reds bought his contract in 1917, and he was a backup catcher on the major league squad from 1918 to 1920.

In 1919, he batted .320 (in 15 games), and the Reds won the National League pennant and World Series.

Known as "Roarin' Nick" because of his "umpire baiting" on the field, Allen claimed that his actions were done solely to increase attendance at the ballpark.