贝多芬半岛是南极洲的半岛，位于亚历山大一世岛西南部，长100公里、宽100公里，北面是威尔金斯冰架，南面是巴赫冰架，该半岛以音乐家贝多芬命名。

The Beethoven Peninsula is a deeply indented, ice-covered peninsula, 60 miles (100 km) long in a northeast-southwest direction and 60 miles (100 km) wide at its broadest part, forming the southwest part of Alexander Island, which lies off the southwestern portion of the Antarctic Peninsula. The south side of the peninsula is supported by the Bach Ice Shelf whilst the north side of the peninsula is supported by the Wilkins Ice Shelf. The Mendelssohn Inlet, the Brahms Inlet and the Verdi Inlet apparently intrude into it. The Bach Ice Shelf, Rossini Point and Berlioz Point are some distance away, on the Ronne Entrance from the Southern Ocean. Beethoven Peninsula is one of the eight peninsulas of Alexander Island.