Anthony Ernst Mary Duynstee (original spelling Duijnstee; 24 December 1920 – 9 May 2014), known as Bob Duynstee, was a Dutch politician who served as a member of the House of Representatives of the Netherlands between 1956 and 1967 and as State Secretary for Defence for the Royal Netherlands Air Force in the De Jong cabinet of 1967–71.

With World II unfolding in continental Europe, Duynstee was asked in August 1940 to be part of the Princess Irene Brigade which he did.

He wrote his thesis on "Keynes theory of full employment and public finance".

[1] In 1948 he joined the then newly founded Organisation for Economic Co-operation and Development where he headed the office for Scandinavian countries until 1952.

He however was made State Secretary for Defence for the Royal Netherlands Air Force in the cabinet of Piet de Jong.