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Marine yeasts have versatile applications in the industrial, medical, and environmental fields. However, they have received little attention compared to terrestrial yeasts and filamentous fungi. In this study, a phylogenetic analysis of 11 marine-derived yeasts was conducted using internal transcribed spacers and nuclear large subunit rDNA, and their bioactivities, such as antioxidant, antibacterial, and tyrosinase inhibition activities, were investigated. The 11 marine-derived yeasts were identified to belong to seven species including <i>Geotrichum candidum</i>, <i>Metschnikowia bicuspidata</i>, <i>Papiliotrema fonsecae</i>, <i>Rhodotorula mucilaginosa</i>, <i>Vishniacozyma carnescens</i>, <i>Yamadazyma olivae</i>, <i>and Yarrowia lipolytica</i>, and three strains of these were candidates for new species of the genera <i>Aureobasidium</i>, <i>Rhodotorula</i>, and <i>Vishniacozyma</i>. Most extracts showed antioxidant activity, whereas seven strains exhibited antibacterial activities against <i>Bacillus subtilis</i>. Only <i>Aureobasidium</i> sp. US-Sd3 among the 11 isolates showed tyrosinase inhibition. <i>Metschnikowia bicuspidata</i> BP-Up1 and <i>Yamadazyma olivae</i> K2-6 showed notable radical-scavenging activity, which has not been previously reported. Moreover, <i>Aureobasidium</i> sp. US-Sd3 exhibited the highest antibacterial and tyrosinase inhibitory activities. These results demonstrate the potential of marine-derived yeasts as a source of bioactive compounds for improving industrial applications.