Funeral service at Cathedral Basilica of St. John the Baptist on Sunday: photo - Jacek Turczyk/PAP
Mazowiecki, who died at the age of 86 last Monday, was a widely respected political leader during the Solidarity period in the 1980s and directly after the fall of communism in 1989.
A procession, led by Archbishop of Warsaw, Cardinal Kazimierz Nycz, took Mazowiecki's coffin, where it had been lying in state at the Presidential Palace on Saturday, to the Cathedral Basilica of St. John the Baptist for the funeral service.
Attending the funeral were President Bronislaw Komorowski and his wife Anna, Prime Minister Donald Tusk and wife Malgorzata, European Commission president Jose Manuel Barroso and former presidents of Poland Lech Walesa and Aleksander Kwasniewski, as well as government ministers and leaders of the opposition.
Mazowiecki was later laid to rest in the afternoon at his family grave in Laski, near the Polish capital, where his wife Ewa is also buried.
Guests attending Mazowiecki funeral: First row, from left: Parliament Speaker Ewa Kopacz, Anna Komorowska and President Bronislaw Komorowski; second row from left: former President Aleksander Kwasniewski, former President Lech Walesa, head of the European Commission Jose Manuel Barroso, Prime Minister Donald Tusk and Malgorzata Tusk: photo - PAP/Jacek Turczyk
A member of the communist-controlled Catholic PAX organization from 1945 to 1955, Tadeusz Mazowiecki was expelled after the authorities believed he was a member of an internal opposition group.
He went on to establish, with others, the Catholic Intelligentsia Club in 1957 and became editor of the Wiez magazine.
From 1981, he was the first editor of the opposition Tygodnik Solidarność (Solidarity Weekly) magazine which was banned when the communists declared martial law in December 1981.
Mazowiecki was arrested during the crackdown and was one of the last prisoners to be released in December 1982.
He become one of the main negotiators for the Solidarity trade union during the Round Table talks of 1989 and took over as Poland's first non-communist prime minister in September that year after the newly elected parliament gave him a vote of confidence.
Mazowiecki opposed Lech Walesa in presidential elections at the end of 1990 but pulled out of the contest after the first ballot.
He went on to become Special Emissary for the United Nations to Bosnia and Herzegovina during the Balkans war and member of the Polish lower house of parliament for the centre-right Freedom Union: he was also a strong advocate of Poland joining the European Union and a more integrated Europe. (pg)