The 1986–87 Divizia B was the 47th season of the second tier of the Romanian football league system.
The format has been maintained to three series, each of them having 18 teams. At the end of the season the winners of the series promoted to Divizia A and the last four places from each series relegated to Divizia C.
Team changes
To Divizia B
Promoted from Divizia C
Minerul Gura Humorului
Unirea Dinamo Focșani
FEPA 74 Bârlad
Unirea Slobozia
Autobuzul București
ROVA Roșiori
Gloria Pandurii Târgu Jiu
Minerul Paroșeni
Steaua CFR Cluj
Unio Satu Mare
Inter Sibiu
Poiana Câmpina
Relegated from Divizia A
Politehnica Timișoara
ASA Târgu Mureș
Bihor Oradea
From Divizia B
Relegated to Divizia C
Metalul Plopeni
Muscelul Câmpulung
CFR Timișoara
Dunărea Călărași
Avântul Reghin
Unirea Alba Iulia
Chimia Fălticeni
Șoimii IPA Sibiu
Înfrățirea Oradea
Minerul Vatra Dornei
ICSIM București
Minerul Lupeni
Promoted to Divizia A
Oțelul Galați
Flacăra Moreni
Jiul Petroșani
Renamed teams
Aripile Bacău was renamed as Aripile Victoria Bacău.
Delta Tulcea was renamed as Delta Dinamo Tulcea.