The 1999 1. divisjon, Norway's second-tier football league, began play on 17 April 1999 and ended on 17 October 1999.
Haugesund and Bryne won direct promotion to Tippeligaen, while Start was promoted after having won 3-2 on aggregate against Strømsgodset in the promotion-playoff.
Lofoten, Skjetten, Hødd and Clausenengen was relegated to the 2. divisjon.
Source:[1] Start (3rd in 1. divisjon) won the play-offs against Strømsgodset (12th in Tippeligaen) 3–2 on aggregate.
Start won 3–2 on aggregate and was promoted to Tippeligaen.