2003–04 Eerste Klasse was a Dutch association football season of the Eerste Klasse.
Saturday champions were: A: RKAV Volendam B: BVV Barendrecht C: Kozakken Boys D: Excelsior '31 E: ONS Sneek
Sunday champions were: A: DWV B: UVS Leiden C: VV Geldrop D: EVV Echt E: VV Germania F: WKE '16