Tan-y-Bwlch means under the pass in Welsh and may refer to the following places in Wales: Tan-y-Bwlch, Aberystwyth, a nature reserve Tan-y-Bwlch, Maentwrog, a village Tan-y-Bwlch railway station Plas Tan y Bwlch, the Snowdonia National Park environmental studies centre