Josiah Alexander Sila (born 25 June 2003), known professionally as Joey Alexander, is an Indonesian jazz pianist. He became the first Indonesian musician to perform on the Grammy Awards as well as to chart on Billboard 200 when his album My Favorite Things debuted at number 174 and then peaked at 59.

Widely regarded as a wunderkind, Alexander was mentored in jazz piano by his father. He won the Grand Prix at the 2013 Master-Jam Fest when he was nine.

In 2014, Wynton Marsalis invited him to play at Jazz at Lincoln Center. His first album, My Favorite Things, was released in 2015 when he was 11 years old. Alexander played at the Montreal and Newport Jazz Festivals in 2015 and has performed for Herbie Hancock, Bill Clinton, Wendy Kiess, and Barack Obama.