From 1963 to 1968, Bartholomew pursued his postgraduate studies at the Pontifical Oriental Institute in Rome, the Ecumenical Institute of Bossey in Switzerland and the Ludwig Maximilians University of Munich in Germany.
Dari 1963 sampai 1968, Bartolomeus menyelesaikan studi-studi pasca kelulusannya di Institut Oriental Pontifikal di Roma, Institut Ekumenikal Bossey di Swiss dan Universitas Maximilian Ludwig Munich di Jerman.