James Roos Breithaupt[a] KStJ CD QC (September 7, 1934 – August 29, 2018[1]) was a Canadian politician.
He won a total of five elections, and was the longest serving former Member of Provincial Parliament (MPP) for Kitchener since Canadian Confederation in 1867.
Between 1952 and 1982, he spent a total of thirty years on campus as a student, lecturer, Board Member and Vice-Chairman.
Breithaupt resigned from the legislature on November 1, 1984, and was appointed chairman of the Ontario Law Reform Commission.
He was also the vice-chairman of the Last Post Fund (Ontario Branch) which attends to the funerals and burial of veterans without financial resources.
He was the chairman of the German Pioneer's Day Committee locally in Kitchener-Waterloo for four years, and was a Deputy Judge in the Small Claims Courts of Kitchener, Cambridge, Woodstock, Stratford and Hamilton since 1993.