Nantgarw tradition is a style of Morris dancing from the South and Valleys regions of Wales, specifically associated with the small village of Nantgarw. The style encompasses both handkerchief and stick dances. The dances call for eight dancers in four pairs. There are now five dances in the Nantgarw tradition: Y Gaseg Eira (The Snow Mare), Hela'r Sgwarnog (Hunting the Hare), Ty Coch Caerdydd (Red House of Cardiff), Y Derwydd (The Druid) and Y Goron (The ). They are most frequently performed by Cardiff Morris. The style was first put into dance notation by Dr. Ceinwen Thomas (1911-2008) who wrote down what her mother, Catherine Margretta Thomas, could remember of the dances that had been danced locally when she was young.
The Nantgarw dances take their name from the village of Nantgarw in the county borough of Rhondda Cynon Taf where they are said to have first been performed.
Catherine Margretta Thomas was born in 1880 in the village of Nantgarw. Her parents were Daniel and Hannah Davies. As a child she enjoyed watching the local dances as they were performed in an open space below Twyn Chapel in Caerphilly and at Nantgarw and Y Groes Wen. Due to the hostility of the local churches to folk dancing, Catherine Margretta Thomas' own mother was not keen on her daughter going to see these dances, but Catherine was able to convince her father to take her along to witness the displays. The rise of Nonconformism in Wales meant that by the time Catherine Margretta Thomas was in her teens folk dancing had practically been eradicated in Nantgarw.