George Phelps Mellick Belshaw (born July 14, 1928) is the ninth bishop of the Episcopal Diocese of New Jersey, serving from 1983 to 1994.
Mellick Belshaw earned his undergraduate degree at Sewanee in 1951, and his Master of Sacred Theology degree at General Theological Seminary in 1959. After his graduation from Sewanee he was ordained in July 1954 and became the fourth Vicar of St. Matthew's Episcopal Church (Waimanalo, Hawaii). After three years he became a fellow of the General Theological Seminary, New York City; he followed that with appointments as Rector of Christ Church (Dover, Delaware) and St. George's-by-the-River Episcopal Church in Rumson, New Jersey.
He was then consecrated Suffragan Bishop of the Diocese on February 3, 1975 and was elected Bishop Coadjutor on April 24, 1982. He assumed the title of Bishop of the Diocese of New Jersey upon the retirement of Bishop Albert W. Van Duzer in 1983 and served for 11 years.
Mellick Belshaw was born in Plainfield, New Jersey. He married Elizabeth Wheeler in June 1954; they had three children.