Reduzum (Dutch: Roordahuizum) is a village in Leeuwarden municipality in the province of Friesland, the Netherlands.

[3] The community is notable for working towards a sustainable energy consumption within the village.

[4] Reduzum is a terp (artificial living mound) settlement from the early Middle Ages.

The Dutch Reformed church which probably dates from the 15th century was enlarged in 1726 and received its iconic entry gate.

Before 2014, Roordahuizum was part of Boarnsterhim municipality and before 1984 it belonged to Idaarderadeel.