| Nederlek | |
| Settlement Type: | Former municipality |
| Flag Size: | 100x67px |
| Map Alt: | Highlighted position of Nederlek in a municipal map of South Holland |
| Coordinates: | 51.9106°N 4.6606°W |
| Subdivision Type: | Country |
| Subdivision Name: | Netherlands |
| Subdivision Type1: | Province |
| Subdivision Name1: | South Holland |
| Subdivision Type2: | Municipality |
| Subdivision Name2: | Krimpenerwaard |
| Established Title: | Established |
| Established Date: | 1 January 1985 |
| Unit Pref: | Metric |
| Elevation Footnotes: | [1] |
| Elevation M: | -1 |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postcode |
| Postal Code: | 2930–2931, 2940–2941 |
| Area Code Type: | Area code |
| Area Code: | 0180 |
Nederlek (pronounced as /nl/) is a former municipality in the western Netherlands, in the province of South Holland. Since 2015 it has been a part of the municipality of Krimpenerwaard.
The former municipality covered an area of NaNNederlek}} of which NaNNederlek}} was covered by water. It was formed on 1 January 1985, by the amalgamation of the municipalities Krimpen aan de Lek and Lekkerkerk. Its name means "Lower Lek", a reference to its location on the Lek River.
There is no town called Nederlek; the former municipality consisted of the population centres Krimpen aan de Lek and Lekkerkerk. The last town gained notoriety in 1980 when a large amount of toxic waste was found underneath a residential area built in the 1970s. The cost of cleaning up the mess ran up to 188 million guilders (approximately 90 million US dollars).