R03 may refer to:
AAA battery Alkali Lake State Airport in Lake County, Oregon ATC code R03, a subgroup of the Anatomical Therapeutic Chemical Classification System
See also
R3.0 (album), a 2017 album by Regine Velasquez R3.0 (concert), a 2017 concert by Regine Velasquez ro-3 (disambiguation) R30 (disambiguation) R3 (disambiguation) R (disambiguation)