Sir Andrew Agnew, 3rd Baronet (died 1702) was a Scottish shire commissioner of parliament who was the son of Sir Andrew Agnew, 2nd Baronet and Lady Anne Stewart.
He succeeded his father as 3rd Baronet Agnew, of Lochnaw on the latter's death in 1671.
He was shire commissioner for Wigtownshire in 1685 and 1689–1702.
He married Jane Hay, daughter of Thomas Hay and Jean Hamilton (24 October 1656), and had issue:
This biography of a baronet in the baronetage of Nova Scotia is a stub.