The Liebenbergsvlei River is a tributary of the Wilge River, flowing in the Free State province of South Africa.

The Liebenbergsvlei is a conduit for water delivered by the Lesotho Highlands Water Project. The water is discharged at the As River Outfall, situated 9 km north of Clarens, which was opened in 1998. The As delivers water to the Saulspoort Dam and the Liebenbergsvlei and Wilge Rivers downstream, where after the water enters the Vaal Dam. The Vaal Dam can also be augmented from the Tugela-Vaal Water Project, by releasing water from the Sterkfontein Dam via the Nuwejaarspruit and Wilge River.

The annual Liebensbergvlei canoe marathon is an annual event consisting of two day stages. It starts near Reitz, and the first stage ends 33 km downstream at Zorgvliet farm, near Tweeling. The second day starts at Bruinswick farm north of Tweeling and ends at Frankfort.

• Op Pad in Suid-Afrika. Erasmus, B.P.J. 1995. ISBN 1-86842-026-4
• South Africa Road Atlas. Mapstudio. ISBN 978 1 77026 154 9

27°19′26″S 28°31′03″E / 27.3238°S 28.5176°E / -27.3238; 28.5176