Curwen's Bay Barb (c. 1690 – c. 1728) was a foundation sire of the Thoroughbred breed.
A bay horse with a white blaze, he was imported by Henry Curwen in 1698 from France.
One of his early sons, Mixbury, stood just over 13 hands high and apparently "there were not more that two horses of his day that could beat him under light wrights".
His sire line is extinct, but he made a significant contribution to the Thoroughbred breed.
However Curwen's Bay Barb contributed significantly to the breed through other lines of descent.