Alexander Glantz (born January 23, 1995), known professionally as Alexander 23, is an American singer, songwriter, multi-instrumentalist, engineer, and record producer. Since releasing his first string of singles and EP in 2019, he has collaborated with artists such as Selena Gomez, Olivia Rodrigo, Jeremy Zucker, Noah Kahan and mxmtoon, and has accumulated hundreds of millions of streams on Spotify.