Frankie Armstrong (born 1941) is an English folk singer and voice teacher who has been performing professionally since 1964. She studied and recorded with leading figures of the British folk revival including Louis Killen, Ewan MacColl, and A.L. Lloyd.

Armstrong is also the founder of the Natural Voice Network and a pioneer in voice workshop teaching. In 2018, she received a Gold Badge Award from the English Folk Dance and Song Society for her contributions to folk music.