The singer's management and publicist confirmed the news via Facebook. Dyble announced in November that she had been diagnosed with lung cancer and was starting chemotherapy. "The mindless thing in my lung is malignant and is spreadings its tendrils far and wide," she wrote in a statement at the time.
The folk artist, who also had a solo career, had been suffering from a long-term illness.
Dyble rose to prominence during the 1960s and performed on Fairport Convention songs including “Time Will Show The Wiser”.
A statement from her agent said: “It is with great sadness that we announce that English singer-songwriter Judy Dyble passed away on July 12 following a long illness borne with great courage.
“Judy Dyble was one of the pioneers of the English folk rock scene in the 1960s, most notably as a founding member of Fairport Convention and vocalist with cult band Trader Horne.