| Personal information | |||
|---|---|---|---|
| Date of birth | 8 March 1963 | ||
| Place of birth | Bamble, Norway | ||
| Height | 1.85 m (6 ft 1 in) | ||
| Position(s) | Defender | ||
| Senior career* | |||
| Years | Team | Apps | (Gls) |
| –1982 | Pors | ||
| 1983–1985 | Eik-Tønsberg | 47 | (1) |
| 1986 | Jerv | ||
| 1987–1988 | Brann | 42 | (1) |
| 1989 | Start | 8 | (0) |
| 1989–1992 | Hertha BSC | 74 | (5) |
| 1992–1994 | AGF Aarhus | 67 | (1) |
| 1994 | Sogndal | 11 | (0) |
| 1995–1996 | Rosenborg | 0 | (0) |
| 1996 | Byåsen | ||
| International career | |||
| 1982–1983 | Norway U21 | 7 | (1) |
| 1989 | Norway B | 1 | (0) |
| 1989–1990 | Norway | 5 | (0) |
| Managerial career | |||
| 1996–1998 | Byåsen | ||
| 1999–2002 | Start | ||
| 2003–2004 | Sogndal | ||
| 2005 | GIF Sundsvall | ||
| 2006–2009 | Notodden | ||
| 2011–2012 | New York Red Bulls (assistant) | ||
| 2013–2015 | Bodø/Glimt | ||
| 2016 | Fredrikstad | ||
| 2018–2021 | Bryne | ||
| 2022– | Lyn | ||
| *Club domestic league appearances and goals | |||
Jan Halvor Halvorsen (born 8 March 1963) is a former Norwegian football player and the current manager of Lyn.