Andreas is a common male name in Cyprus, Greece, Germany, Flanders and Scandinavia. In the Greek language, from which it derives it means valiant. It may refer to:
- St. Andrew, the Christian apostle.
- Saint Andrew of Crete
- Andreas of Alexandria, martyr, saint, and companion to Faustus, Abibus and Dionysius of Alexandria
- Andreas is both a town and a parish in the Isle of Man.
- Andreas was a physician in Ancient Greece.
- Andreas, an Old English poem about St Andrew the Apostle.
- Andreas, or Aindréas († 1184), first known bishop of Caithness, Scotland
- George Andreas Papandreou, foreign minister of Greece from 1999 to 2004
- Andreas, a typeface created by Linotype.
- Andreas (comic author), comic author of Rork
- Andreas Syggros, a Greek politician of the 19th century.
- Andreas Vollenweider, a Swiss composer and musician.
- Andreas Capellanus, writer of De amore
- Andreas Kaimakamis is a renowned architect
