布洛克宰尔（Blokzijl）是荷兰的城镇，位于该国东部，由上爱塞省负责管辖，镇上建于1609年的基督教教堂是该国最早期的基督教教堂之一，2006年人口1,110。

Blokzijl is a city located southwest of Steenwijk in the province of Overijssel, the Netherlands.

Blokzijl grew in the 1580s. During the siege of Steenwijk, the Dutch built there a fortified lock or in local dialect zijl or siel. It received city rights in 1672. Until 1973, it was a separate municipality; it is now part of Steenwijkerland.