ARSA
ARSA or Arsa may refer to:
 Arylsulfatase A, gene for a human protein
 All-Russian Scout Association
 Arakan Rohingya Salvation Army, insurgent group in Rakhine State, Myanmar (Burma)
 Arsa, a settlement in Albești, Constanța, Romania
 Arsenije Milošević "Arsa" (1931–2006), Yugoslav Serbian film and television director
 Associate of the Royal Scottish Academy
 Automated Radioxenon Sampler Analyzer

