Sidney Arodin, born Sidney Arnandan (or Arnondrin/Arnondin) on March 29, 1901, in Westwego, Louisiana, was an influential American jazz clarinetist and songwriter. He is most renowned for co-writing the jazz and pop standard "Lazy River" with Hoagy Carmichael. Arodin began playing the clarinet at the age of 15 and quickly became a fixture in the New Orleans music scene, performing at local gatherings and on riverboats.

In 1922, Arodin moved to New York City, where he played with Johnny Stein's New Orleans Jazz Band and later with Jimmy Durante. He returned to Louisiana to collaborate with musicians like Wingy Manone and Sharkey Bonano. During the 1930s, Arodin worked with Louis Prima and participated in a revival of the New Orleans Rhythm Kings. Despite his significant contributions to music, many of his performances were mistakenly credited to another musician, Charlie Cordella.

Arodin's health began to decline after 1941, limiting his ability to perform live. Nevertheless, he recorded with several notable musicians, including Johnnie Miller, Albert Brunies, Monk Hazel, and the Jones-Collins Astoria Hot Eight. Despite his declining health, Arodin continued to play occasionally until his death in New Orleans on February 6, 1948. His legacy endures through his compositions and recordings, particularly the enduring classic "Lazy River."