Peter Martin Anker (21 March 1903 – 7 January 1977) was a Norwegian diplomat. He worked for the League of Nations, Red Cross and United Nations before, during and after the Second World War. He was then an ambassador in European, Asian and African countries from 1951 to 1973. He was stationed in six countries, but with side responsibilities for other countries, he was an ambassador in fifteen countries during his career (with Austria counted twice).