Penn Tarn () is a mountain lake (tarn) located 0.1 nautical miles (0.2 km) north of Princeton Tarn in the southwest part of Tarn Valley, Victoria Land. The feature is one of four tarns in the valley named by the Victoria University of Wellington Antarctic Expedition (VUWAE), 1965–66, after American universities; Penn is a colloquial form of reference to the University of Pennsylvania. See also Harvard Tarn Princeton Tarn Yale Tarn University of Pennsylvania Lakes of Victoria Land Scott Coast