The Hamilton Watch Company is a brand of the Swatch Group, a Swiss watch company based in Bienne, Switzerland. The Hamilton Watch Company was formerly a storied American watch design and manufacturing company, which incorporated in 1892 and produced its first watch in 1893.

After its formation, the Hamilton Watch Company went on to manufacture and market pocket watches and wristwatches, ending American manufacture in 1969. Through a series of mergers and acquisitions, the Hamilton Watch Company became a diversified conglomerate itself and was subsequently purchased by a larger holding group, the third company integrated into what ultimately evolved into the Swatch group.

Today simply called Hamilton, the brand is one of more than twenty watch brands belonging to the Swatch Group, the world's largest watch manufacturer and marketer.