Myfanwy (, ) is a feminine given name popularised by the Welsh song, Myfanwy composed by Joseph Parry and first published in 1875.
The name may refer to:
Myfanwy Ashmore (born 1970), Canadian artist Myfanwy Bekker, South African artist Myfanwy Fychan (born mid-14th century), Welsh noblewoman, subject of many poems Myfanwy Haycock (1913–1963), Welsh poet Myfanwy Horne (1933–2013), Australian journalist, writer, reviewer and book editor Myfanwy Howell (1903-1988), Welsh television broadcaster Myfanwy Macleod (born 1961), Canadian artist Myfanwy Pavelic (1916–2007), Canadian portrait painter Myfanwy Piper (1911–1997), British art critic and opera librettist Myfanwy Pryce (1890–1976), Welsh novelist and short story writer Myfanwy Talog (1944–1995), Welsh actress Myfanwy Warhurst (born 1973), Australian radio announcer Myfanwy Waring (born 1977), Welsh actress Myvanwy M. Dick (1910–1993), British-American zoologist and curator