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Sofia Vembo (Greek: Σοφία Βέμπο, Gallipoli, 1910 - Athens, 11 March 1978) was a leading Greek singer and actress active from the interwar period to the early postwar years and the 50s. She became best known for her performance of patriotic songs during the Greco-Italian War, when she was dubbed the "Songstress of Victory".

Her real name was Efi Bebo (Έφη Μπέμπο). She was born in Gallipoli, Eastern Thrace, in 1910, but after the Asia Minor Catastrophe her family moved to Tsaritsani in Greece, where her father became a tobacco worker, and later to Volos.

She began her career in Thessaloniki in the early 1930s. In the winter of 1933 she was hired by the theater operator Fotis Samartzis of the Kentrikon theater for the revue "Parrot 1933". She then began to record romantic songs for the Columbia company, achieving fame because of her distinctly sonorous contralto voice.

Her reputation however skyrocketed after the Italian attack on Greece on 28 October 1940, when her performance of patriotic and satirical songs became a major inspiration for the fighting soldiers. At the same time, she offered 2,000 gold pounds from her own fortune to the Hellenic Navy. Following the German invasion and occupation of the country in April 1941, she was transported to the Middle East, where she continued to perform for the Greek troops in exile.

After the war, in 1949, she acquired her own theatre, the "Vembo Theatre", in the Metaxourgeio quarter of Athens. In 1957, she married her long-time lover Mimis Traïforos. During the 60s, she began to perform less and less, before finally retiring in the early 70s. She died on 11 March 1978.

Because of her role in the war and her efforts during the Axis occupation, she was awarded the rank of Major in the Greek Army.