Komárom county (in Latin: comitatus Comaromiensis, in Hungarian: Komárom (vár)megye, in Slovak: Komárnanský komitát / Komárnanská stolica / Komárnanská župa, in German: Komorner Gespanschaft / Komitat Komorn) was an administrative county (comitatus) of the Kingdom of Hungary in present-day southern Slovakia (1/2) and north-western Hungary (1/2) on both sides of the Danube river.