Sylvain Julien Victor Arend (6 August 1902 – 18 February 1992) was a Belgian astronomer born in Robelmont, Luxembourg province, Belgium.
His main interest was astrometry.Together with Georges Roland, he discovered the bright comet C/1956 R1 (Arend-Roland).
He also discovered, or co-discovered, the periodic comets 49P/Arend-Rigaux and 50P/Arend, Nova Scuti 1952, and a number of asteroids, including notably the Amor asteroid 1916 Boreas and the Trojan asteroid 1583 Antilochus.