The Ole Bull was a sloop built in Milwaukee sometime in the early 1850s or late 1840s. The sloop was named for Ole Bornemann or "Ole Bull" the famous virtuoso Norwegian Violinist. The vessel was described as being "a clinker built boat much like a double ender Norwegian fishing boat." It was owned by a William Woodruff and Captained by a Captain Larsen.
On 21 January 1855, the sloop Ole Bull was tied up at the old entrance to the mouth of the Milwaukee River when during a windy night the vessel broke from its moorings and drifted out into Lake Michigan, where it most likely sank, "retired to Davy Jones' Locker".