Felix Arndt (May 20, 1889 – October 16, 1918) was an American pianist and composer renowned for his contributions to popular music in the early 20th century. Born in New York, Arndt was of aristocratic descent, with his mother, Countess Fevrier, being related to Napoleon III, and his father, Hugo Arndt, hailing from Switzerland. Educated in New York, he studied under music teachers such as Carl Lachmund.

Arndt's career was marked by his extensive work in vaudeville, composing songs for the famous duo Jack Norworth and Nora Bayes, and he was a prolific recording artist, creating over 3000 piano rolls for companies like Duo-Art and QRS Records. His influence extended to notable musicians, including the young George Gershwin, who visited Arndt at his studio in Manhattan.

He is best remembered for his 1915 composition "Nola," a piece dedicated to his fiancée and later wife, Nola Locke. This composition is often considered a pioneering work in the novelty piano genre and was famously used as the theme by the Vincent Lopez orchestra. "Nola" also enjoyed later success with a top ten hit rendition by Les Paul in 1950 and a vocal version by Billy Williams in 1959.

Arndt's life was tragically cut short when he succumbed to the Spanish flu in New York City at the age of 29. He is buried at Sleepy Hollow Cemetery in Tarrytown, NY. Despite his brief life, Arndt's musical legacy, particularly through "Nola," has endured well beyond his years.