Dr Colin Sinclair Mayne is an agricultural scientist from Northern Ireland. Since February 2009, he has been the departmental scientific advisor for Northern Ireland's Department of Agriculture and Rural Development and the director of Sustainable Agri-Food Sciences at the Agri-Food and Biosciences Institute.He is is a past president of the British Society of Animal Science and has been president of the British Grassland Society since 31 March 2009.