Neil R. Grabois was an American mathematician and university administrator. He held positions as the dean, provost, and chair of the department of mathematical sciences of Williams College; as the thirteenth President of Colgate University, from 1988 to 1999; as Vice President at the Carnegie Corporation in New York; and as the dean of the Milano School of International Affairs, Management, and Urban Policy at The New School, where he served from 2010 until his departure in 2013.