Jakob Storm Piil (born 9 March 1973) is a Danish former professional road bicycle racer, where he later lived many years in Odense.

He started his career as a track racer, riding six-day races with shifting partners, including the Danish riders Michael Sandstød, Tayeb Braikia, and Jimmi Madsen.

His first year at Team CSC wasn't entirely successful, as a crash into a car just before the Milan–San Remo ruined the first four months of his season, though he still managed a few minor results.

Most of the 2005 season was ruined due to injuries, and Piil was left out of Team CSC's setup for the 2005 Tour de France.

Instead, he rode the Vuelta a España, where he once again showed his tenacity to attack, and looked in great form until illness forced him to retire from the race.