| Þórhallur Dan Jóhannsson | |
| Birth Date: | 1972 12, df=yes |
| Position: | Defender |
| Years1: | 1989–1996 |
| Clubs1: | Fylkir |
| Years2: | 1997 |
| Clubs2: | KR |
| Years3: | 1997–1999 |
| Clubs3: | Vejle BK |
| Years4: | 1999–2004 |
| Clubs4: | Fylkir |
| Years5: | 2005–2006 |
| Clubs5: | Fram |
| Years6: | 2006 |
| Clubs6: | Fylkir |
| Years7: | 2006–2010 |
| Clubs7: | Haukar |
| Years8: | 2011 |
| Clubs8: | UMF Álftanes |
| Nationalyears1: | 1996, 2002 |
| Nationalteam1: | Iceland |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
Þórhallur Dan Jóhannsson (born 5 December 1972) is a retired Icelandic football defender.[1]