Originally Posted by Webfoot Hero
Roxxon has so far been mentioned/seen in A Funny Thing Happened on the Way to Thor's Hammer with Coulson stopping at a Roxxon gas station and now in IM3 with a kidnapped Roxxon executive being threatened in front of the President by The Mandarin (it's a clip that's been shown when Kingsley was doing the press tour for IM3.)
They've been referenced in all of the Iron Man films, actually. They seem to be located near Stark, or at least one of their buildings is, as seen in Iron Man. There's even a Roxxon truck featured in the battle against Stane. They also sponsored a car in Iron Man 2.