A popular fan theory suggesting Fallout and The Elder Scrolls share a universe emerged after references to items from one started popping up in the other franchise. There’s a lot of romance to this theory and it’s been thought that the rumoured forthcoming Starfield would officially ‘unify’ them, so to speak.
Though, when talking to Gamespot, Pete Hines categorically shut this theory down.
“I haven’t the foggiest of notion how anybody could make the leap that they are in fact part of the same thing,” he said. “We made Elder Scrolls, and a completely different developer and publisher came up with Fallout, which we then acquired.”