Daniel Massey (24 February 1798 – 15 November 1856) was an American-born Canadian blacksmith and businessman in what is now Newcastle, Ontario.

[6] Massey left home in 1817 at age 19 and spent several years clearing land for farms, which he then sold.

[2] The same year, he brought a mechanical thresher, "one of the first... if not the very first imported into Upper Canada", back from a visit to Watertown; this was the start of his work on and fascination with farm implements.

[2][4][7][3] He sold the farm to Hart in 1847 and moved to the Newcastle area, where he partnered with Richard F. Vaughan, owner of a struggling foundry and blacksmith shop in Bond Head.

[6][2][8][4][3] His son Hart joined the company as a superintendent in 1851, becoming a partner in 1853 and sole owner in 1856 when his father retired.

The firm merged with its main competitor, A. Harris, Son and Company Limited in 1891, at which point it became Massey-Harris,[3][1][8][6] which produced the world's first commercially successful self-propelled combine harvester in 1938.