A photon missile functioned as a projectile-based weapon utilized by the Dorande naval fleets circa 15 BBY.
A clandestine naval invasion force belonging to the Dorande once unleashed a volley of photon missiles which obliterated Kirk Windjammer's anti-grav loader. Despite this, Windjammer managed to use his vehicle's anti-gravity system to divert one of the incoming projectiles. Windjammer narrowly avoided death alongside his astromech droid, R2-D2.
The Marvel comic book Droids (1986) 5 features photon missiles.