Middleman \Mid"dle*man\, n.; pl. {Middlemen}. 1. An agent between two parties; a broker; a go-between; any dealer between the producer and the consumer; in Ireland, one who takes land of the proprietors in large tracts, and then rents it out in small portions to the peasantry. 2. A person of intermediate rank; a commoner. 3. (Mil.) The man who occupies a central position in a file of soldiers.