Konstantinos (Kostas) Bigalis (born 15 March 1953) is a popular singer and musician who is known for representing Greece in the Eurovision Song Contest on two occasions: as a singer and composer in 1994 and as a composer in 1996.

Kostas was born in Athens. He started his career in 1975 after winning the first prize at a music contest for amateurs. He took part in many festivals, he played in the rock opera Jesus Christ Super Star, he entered the Song Festival of Thessaloniki where he was awarded the awards for Best Lyrics and Best Composition and in 1981 he recorded two songs for the soundtrack of the American film Next One. In 1982 he starred as Simon in a religious themed TV series, alongside Anthony Hopkins.In 1984 he formed the music duo Big Alice along with Mariana Efstratiou. They had a number one hit in Greece, entitled I Miss You and it was out to the music markets of 18 other European countries.

Kostas toured abroad for quite a long time and in 1989 he returned to Greece in order to launch a solo career. He had his first album the same year. His big hit came in 1992 with his second album that reached platinum sales.