Sem Westerveld (born 18 July 2002) is a Dutch professional footballer who plays as a goalkeeper for Dutch club AZ Alkmaar.
Westerveld made his professional debut with Jong AZ in a 1–0 Eerste Divisie loss to Roda on 4 January 2021.[1] On 18 June 2021, he signed his first professional contract with AZ Alkmaar for three years.[2]
He suffered a torn cruciate knee ligament in 2024 and spent a year out of action. He returned to the Jong AZ team for a match against Vitesse Arnhem in April 2025, in a 2-2 draw.[3]
Westerveld's father Sander Westerveld and grandfather Hennie Ardesch were also professional football goalkeepers.[4] Sem was born in San Sebastián, Spain while his father was playing for Real Sociedad.[5]