Oscar I may refer to:

• Oscar I of Sweden, king of Sweden and Norway
• Oscar I submarine, a class of Russian submarines
• OSCAR 1, the first amateur radio satellite

• Maluri, Vrancea
• Malu Rodrigues
• Malurus amabilis rogersi
• Malurus assimilis
• Malurus brownii
• Malurus callainus
• Malurus cruentatus
• Malurus cyanochlamys
• Malurus cyanotus
• Malurus dulcis
• Malurus edouardi
• Malurus elizabethae
• Malurus grayi campbelli
• Malurus Lamberti
• Malurus leuconotus
• Malurus lorentzi
• Malurus macgillivrayi
• Malurus melanotus
• Malurus moretoni
• Malurus naimii
• Malurus pectoralis
• Malurus pyrrhonotus
• Malurus rogersi
• Malurus wallacei
• Malurus wallacii