Bubbling Over (1923–1938) was an American thoroughbred racehorse and sire, best known for winning the 1926 Kentucky Derby.
Bred in Kentucky, Bubbling Over was sired by English stakes winner North Star out of the mare Beaming Beauty, who in turn was sired by Belmont Stakes winner Sweep.
He was owned by Colonel Bradley of Idle Hour Stock Farm.
He ran first in a field of 13, winning by five lengths over second-place finisher Bagenbaggage, with a time of 2:03 4/5.
Bubbling Over died in 1938 and is buried at Darby Dan Farm in Lexington, Kentucky.