The 2003–04 Divizia B was the 64th season of the second tier of the Romanian football league system.
The format has been changed from two series of 16 teams to three series, each of them consisting of 16 teams. At the end of the season, the winners of the series promoted to Divizia A and the last three places from all the series relegated to Divizia C.
Team changes
To Divizia B
Promoted from Divizia C
Petrolul Moinești
Unirea Urziceni
Juventus București
Dacia Mioveni
Rarora Râmnicu Vâlcea
Jiul Petroșani
Oltul Sfântu Gheorghe
Armătura Zalău
FC Vaslui
Poiana Câmpina
Electrica Constanța
Chindia Târgoviște
Minerul Motru
Certej
Tricotaje Ineu
Laminorul Roman
Building Vânju Mare
ACU Arad
Precizia Săcele
Oașul Negrești
Callatis Mangalia
Relegated from Divizia A
Sportul Studențesc București
UTA Arad
From Divizia B
Relegated to Divizia C
Bucovina Suceava
Gilortul Târgu Cărbunești
Foresta Fălticeni
UM Timișoara
Promoted to Divizia A
Petrolul Ploiești
Apulum Alba Iulia
FC Oradea
Other
Divizia A clubs and bitter rivals, Petrolul Ploiești and Astra Ploiești merged. Astra was absorbed by Petrolul and Oțelul Galați, which initially relegated after the promotion/ relegation play-off against FC Oradea, remained in the top-flight.
Callatis Mangalia was promoted from Divizia C as the best next runner-up, in order to occupy the vacant place.
Renamed teams
Chindia Târgoviște was renamed as FCM Târgoviște.
CS Certej merged with Mureșul Deva, was moved from Certeju de Sus to Deva and renamed as CS Deva.
Extensiv Craiova was renamed as FC Craiova.
League tables
Seria I
Serie II
Seria III
Top scorers
20 goals
Ionuț Mazilu (Sportul Studențesc)
17 goals
Gabriel Apetri (Jiul Petroșani)
13 goals
Viorel Gheorghe (Petrolul Moinești) Cristian Turcu (CFR Cluj)
12 goals
Răzvan Cociș (Universitatea Cluj) Florin Anghel (FC Vaslui) Valentin Badea (FC Vaslui)
11 goals
Robert Roszel (Olimpia Satu Mare)
9 goals
Iulian Ștefan (Pandurii Târgu Jiu) Florin Maxim (Sportul Studențesc)
8 goals
Constantin Barbu (Dacia Mioveni) Marius Păcurar (Politehnica Iași)
7 goals
Constantin Borza (Midia Năvodari) Damian Militaru (Jiul Petroșani) Tiberiu Bălan (Sportul Studențesc) Gigel Ene (Rulmentul Alexandria) Dan Codreanu (Universitatea Cluj)