GUI posted:

RTCW, Wolf09, TNO, TOB and Wolfenstein II are all canon. Wolf3D and its expansions (or parts of them) might be canon going off a newspaper article you can find on TOB.

RTCW gets referenced once or twice during TNO and TOB and BJ meets Caroline during Wolf09, but both games barely have a plot (BJ is a silent character in RTCW) and the NPCs are there as exposition.

If you want to get even more confused then TOB takes place in the same beginning location as RTCW despite the town and castle looking completely different within the two years that have passed between the games. Wolf09 also had a handful of pre-release animated comics that put it, RTCW and Wolf3D/SOD in the same continuity and tried to set-up some organisation called the Fourth Reich as the main enemy - this was all scrapped once that game bombed and the IP was handed over to MachineGames. It also showed BJ fighting Hans Grosse in Wolf3D despite the latter appearing in Wolf09 and neither of them recognising the other despite supposedly having fought before. Don't think about it any of this too hard like I did.