Emyr Llewelyn Jones is a Welsh political activist, who was active during the 1960s and 1970s. Mudiad Adfer was established based on his philosophies, and those of Owain Owain and Professor J. R. Jones. Commonly known as Emyr Llewelyn, he is also known as Emyr Llew. He is the son of author and poet T. Llew Jones.
Llewelyn was educated at Ysgol Gynradd Coed-y-bryn, Llandysul Grammar School, and the University of Wales, Aberystwyth.
He is one of the founders and a contributor to the Welsh monthly publication, Y Faner Newydd.
Llewelyn was imprisoned in 1963 for causing damage to the building site of the dam at Tryweryn; he was sentenced to 12 months imprisonment.
He worked as a Welsh teacher for several decades, at schools in Port Talbot, Llanon and Aberaeron, and now resides in Ffostrasol, Ceredigion.