Serra de la Llena, also known as Serra la Llena, is a mountain chain straddling the municipal terms of Vilanova de Prades (Conca de Barberà comarca), La Pobla de Cérvoles (Garrigues) and Ulldemolins (Priorat), in Catalonia, Spain.

These mountains have characteristic large and rounded rocky outcrops.

The Montsant River runs at the feet of the southern face and the town of Vilanova de Prades is located amidst the rocky outcrops of the range, near the eastern summits.

The Llena mountain range also makes for the mainspring for the Set river, from where its 28-mile length of water rises and flows.

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