Bart Peter Boudewijn Moeyaert (born 9 June 1964) is a Belgian writer.
Moeyaert was born in 1964 in Bruges as the youngest of seven brothers. He is named after the character Bartje in the book series by Anne de Vries and after Baudouin of Belgium (Boudewijn). As is tradition in Belgium, King Baudouin of Belgium is his godfather as Moeyaert is the seventh son in an unbroken succession of sons.
Moeyaert made his debut in 1983 with the book Duet met valse noten. Moeyaert received the Prijs van de Kinder- en Jeugdjury voor het boek in Vlaanderen award for this book in 1984. In 1989, he published the book Suzanne Dantine which he considers to be his real debut with him transitioning from writer to author. Moeyaert later reworked the story into a new book Wespennest (1997).