The 2003–04 Divizia B was the 64th season of the second tier of the Romanian football league system.
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.
CS Certej merged with Mureșul Deva, was moved from Certeju de Sus to Deva and renamed as CS Deva.