The 2004–2005 Liga Alef season saw Maccabi Tzur Shalom (champions of the North Division) and Hapoel Bnei Lod (champions of the South Division) winning the title and promotion to 2005–06.
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At the bottom, Hapoel Tuba, Maccabi Tur'an (from North division), Hapoel Qalansawe and Hapoel Jaljulia (from South division) were all automatically relegated to Liga Bet.
North play-off
The 12th placed club in Liga Alef North, Maccabi Shefa-'Amr, faced Liga Bet North A and North B runners-up, Hapoel Karmiel and Hapoel Umm al-Fahm. The teams played each other in a round-robin tournament, with all matches held at a neutral venue, Nahariya Municipal Stadium.
Hapoel Umm al-Fahm won the play-offs and was promoted to Liga Alef. Maccabi Shefa-'Amr remained in Liga Alef after Hapoel Majd al-Krum (which relegated from Liga Artzit to Liga Alef) folded during the summer.
South play-off
The 12th placed club in Liga Alef South, Beitar Giv'at Ze'ev, faced Liga Bet South A and Liga Bet South B runners-up, Hapoel Azor and Ironi Nes Tziona. The teams played each other in a round-robin tournament, with all matches held at a neutral venue, Bat Yam Municipal Stadium.
Ironi Nes Tziona won the play-offs and was promoted to Liga Alef. Beitar Giv'at Ze'ev remained in Liga Alef after a vacancy was created in the South division, following the merger of Liga Artzit club, Maccabi Ramat Amidar, with Hakoah Ramat Gan.