Carsten Nicolai is a German musician. He uses the stage names Alva Noto, Noto and Aleph-1. He is a member of the music groups Diamond Version with Olaf Bender (Byetone), Signal with Frank Bretschneider and Olaf Bender, Cyclo with Ryoji Ikeda, and Alva Noto + Ryuichi Sakamoto with Ryuichi Sakamoto.

Nicolai was born in Chemnitz, Saxony, Germany (then Karl-Marx-Stadt, Saxony, East Germany) in 1965. He studied architecture and landscape design before pursuing art. In 1999 he founded Raster-Noton.