Robert Scott Dewar (born 10 June 1949), is a retired British diplomat. He was the British ambassador of Ethiopia and Madagascar and the High Commissioner to Mozambique and Nigeria.
He has served as the UK Permanent Representative to the African Union (2004-2006) and the UK Permanent Representative to the Economic Community of West African States (2007-2011). He was a member of board of trustees of the British Red Cross until 2019. He was made a member of the Order of St Michael and St George in 2006.