Agafia Orlov-Buhaev-Constantin (born April 19, 1955) is a Romanian sprint canoer who competed from the mid-1970s to the early 1980s. Competing in three Summer Olympics, she won a gold medal in the K-4 500 m event at Los Angeles in 1984.
Constantin also won eight medals at the ICF Canoe Sprint World Championships with a silver (K-2 500 m: 1977) and seven bronzes (K-2 500 m: 1978, 1979, 1981; K-4 500 m: 1974, 1978, 1979, 1983).