The Hamilton Watch Company is a Swiss manufacturer of wristwatches based in Bienne, Switzerland. The Hamilton Watch Company had its genesis as an 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 integrated into the Swatch Group.

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