Sir Frederick Widdowson Doidge, GCMG, (26 February 1884 Cootamundra, New South Wales – 26 May 1954 London) was a journalist in New Zealand and England, then a National Party member in the New Zealand House of Representatives.
In the 1935 election, Doidge was a candidate of the anti-Labour New Zealand Democrat Party.
He represented the seat of Tauranga for National from 1938 to 1951, when he retired.
He was Minister of Foreign Affairs from 1949 to 1951 in the First National Government of New Zealand, and then became New Zealand's High Commissioner to the United Kingdom from 1951 until his death. He was knighted (K.C.M.G.) in 1953.