Koudekerk aan den Rijn (English: Cold Church upon Rhine) is a village located in the municipality of Alphen aan den Rijn, Netherlands.

It is located about 4 km west of the urban centre, in the province of South Holland.

The 15th century was dedicated to Aleid van Poelgeest who was killed in 1392.

[4] Koudekerk aan den Rijn was a separate municipality until 1991, when it became part of Rijnwoude.

[5] Since 2014 Koudekerk is part of the city Alphen aan den Rijn