Iwo Byczewski (born 29 February 1948, in Poznań) is a Polish diplomat.

He served as Deputy Foreign Minister (1991–1995), Ambassador to Belgium and Permanent Representative to the European Union.

He is a law graduate from the Adam Mickiewicz University in Poznań and studied at the College of Europe (1971–1972, Dante Alighieri promotion) in Bruges.

As active dissident he was taking part in Polish Round Table Agreement negotiations.

[2] He joined the Ministry of Foreign Affairs in 1990 when Poland became independent, serving as vice minister from 1991 to 1995.