OBOS-ligaen 2015 var det nest høyeste nivået i norsk herrefotball i 2015. Ligaen besto av 16 lag. Før sesongen ble det klart at , og rykket ned fra Tippeligaen 2014, mens , , og rykket opp fra Oddsenligaen 2014. Ligaen var i 2015 representert ved 10 av landets 19 fylker, med tre lag hver fra Hordaland og Akershus. Seriens nordligste lag var Levanger, mens seriens sørligste lag var .
Den 25. oktober 2015 ble det klart at vant OBOS-ligaen 2015 én runde før slutt, etter at de slo Sandnes Ulf 2-1 på hjemmebane. Samme dag ble det klart at endte på andreplass.
Endringer Rykket opp fraOddsenligaen 2014 Rykket ned fraTippeligaen 2014 Rykket opp fra1. divisjon 2014 Rykket ned fra1. divisjon 2014
Opp- og nedrykk
De to beste lagene i serien rykker direkte opp til Tippeligaen 2016, mens lagene fra tredje- til sjetteplass skal spille innbyrdes kvalifiseringskamper, hvor vinneren møter nummer 14 i Eliteserien i en play-off-kamp. De fire dårligste lagene rykker ned til PostNord-ligaen 2016.
Opprykk: og .
Kvalifisering: , , og .
Nedrykk: , , og .
Tabell
Tabellplassering etter runde Tabellen lister opp tabellplassering etter siste kamp i hver serierunde. 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