| Rijnwoude | |
| Settlement Type: | Former municipality |
| Flag Size: | 100x67px |
| Map Alt: | Highlighted position of the former municipality of Rijnwoude in a municipal map of South Holland |
| Coordinates: | 52.1333°N 39°W |
| Subdivision Type: | Country |
| Subdivision Name: | Netherlands |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Holland |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Alphen aan den Rijn |
| Established Title: | Established |
| Established Date: | 1 January 1991 |
| Extinct Title: | Dissolved |
| Extinct Date: | 1 January 2014[1] |
| Unit Pref: | Metric |
| Area Footnotes: | [2] |
| Area Total Km2: | 57.89 |
| Area Land Km2: | 56.69 |
| Area Water Km2: | 1.20 |
| Elevation Footnotes: | [3] |
| Elevation M: | -1 |
| Population Footnotes: | [4] |
| Population Total: | 18,523 |
| Population As Of: | 2013 |
| Population Density Km2: | 327 |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postcode |
| Postal Code: | 2390–2396, 2730–2731 |
| Area Code Type: | Area code |
| Area Code: | 0172, 071, 079 |
Rijnwoude (in Dutch; Flemish pronounced as /ˈrɛiɱˌʋʌudə/) was a municipality in the western Netherlands, in the province of South Holland. The municipality covered an area of 57.89km2 of which 1.2km2 was water.
Rijnwoude was formed in 1991 as Rijneveld through the merger of the former municipalities of Benthuizen, Hazerswoude and Koudekerk aan den Rijn. In 1993 the municipality was renamed to Rijnwoude. In 2014 the municipality was dissolved and its land area was amalgamated into Alphen aan den Rijn.
The municipality of Rijnwoude consisted of the communities Benthorn, Benthuizen, Hazerswoude-Dorp, Groenendijk, Hazerswoude-Rijndijk (location of town hall), Hogeveen, and Koudekerk aan den Rijn.