| Type: | Ortsteil |
| Town: | Freudenberg |
| State: | North Rhine-Westphalia |
| Region: | Arnsberg |
| District: | Siegen-Wittgenstein |
| Elevation: | 310 |
| Area: | 2.02 |
| Postal Code: | 57258 |
| Area Code: | 0271 |
| Licence: | SI |
| Website: | Faltblatt der Stadt |
| Year: | 1256 |
Niederholzklau is a constituent community of Freudenberg, Siegen-Wittgenstein, North Rhine-Westphalia, Germany.
Niederholzklau was first mentioned in 1256. Until December 31, 1968, the village belonged as an independent municipality to the Amt Freudenberg. On 1 January 1969 Niederholzklau was renamed a district of the city of Freudenberg.
It borders the Freudenberg districts of Oberholzklau and Alchen and the Siegen district of Langenholdinghausen.
Niederholzklau has 189[1] inhabitants and is therefore the second smallest district of Freudenberg after Mausbach.