Frederick Clarke Withers (4 February 1828 – 7 January 1901) was an English architect in America, especially renowned for his Gothic Revival ecclesiastical designs. For portions of his professional career, he partnered with fellow immigrant Calvert Vaux; both worked in the office of Andrew Jackson Downing in Newburgh, New York, where they began their careers following Downing's accidental death. Withers greatly participated in the introduction of the High Victorian Gothic style to the United States.