James Green aka Sudden is a fictional character created by an English author Oliver Strange in the late 1930s as the hero of a series set in the American Wild West era. Oliver Strange died in in 1952, and the series was revived by Frederick H. Christian in the 1960s. Sudden is portrayed as an intrepid and accurate gunfighter in search of two men who cheated his foster father. James Green earns the nickname "Sudden" because of his lightning speed with a gun. Sudden is portrayed as a stereotypical gunfighter: an intelligent and resourceful drifting cowboy who is respectful of the law, unwilling to use a gun unless absolutely necessary, humanitarian, brave, strong, and fair. The first book was published in 1933 and was followed by 10 more books until the 1940s and featured vivid descriptions of the western American landscape, rare in an author at that time. The series became popular for its exciting narrations combining elements of mystery, suspense, and action in a Wild West setting of dusty towns, ranches, and bar cum saloons.

Nikki Sudden (* 19. Juli 1956 in London als Adrian Nicholas Godfrey; † 26. März 2006 in New York City) war ein englischer Musiker, Sänger, Gitarrist, Produzent und Singer-Songwriter.

Sudden kan avse:

• Inom sporten vardaglig benämning på sudden death.
• Smeknamn för den svenske ishockeyspelaren Mats Sundin.
• Countrysångerskan Ingegerd "Sudden" Eriksson