Kethel en Spaland is a former municipality in the Dutch province of South Holland.
It was located to the north of the city of Schiedam, and covered the village of Kethel and the hamlet Kandelaar.
Kethel en Spaland was a separate municipality until 1941, when it merged with Schiedam.
The former municipal flag consists of a horizontal tricolor, orange-black-orange, at a 2:1:2 ratio.
The flag was designed after the coat of arms, depicting a black cauldron.