Lech Trzeciakowski (24 December 1931 – 7 January 2017) was a Polish historian who served as director of the Western Institute (Instytut Zachodni) in Poznań from 1974 to 1978.

[2] He was the son of Marian Trzeciakowski, who was an insurgent during the Greater Poland uprising and was a civil servant of the Second Polish Republic, and Stefania (née Dębicka).

In 1945, he passed his primary school exit exams and passed the entrance exam for the Karol Marcinkowski High School.

He belonged to the Błękitna Czternastka scouting troop [pl] at the school.

This biographical article about a historian from Poland is a stub.