Martin Roos (born October 17, 1942) is a Romanian cleric, bishop of the Roman Catholic Diocese of Timișoara.

Born into a Banat Swabian family in Satchinez (Knees), Timiș County, he attended the cantors' school in Alba Iulia from 1957 to 1961.

Following the Romanian Revolution of 1989, his bishop, Walter Kasper, allowed him to return to his native country.

In 1990, Timișoara Bishop Sebastian Kräuter named him director of the diocesan chancery.

He became a Monsignor in 1991 and in 1999, following Kräuter's retirement, he was named bishop by Pope John Paul II.