The largest Roman Catholic church of the city has nicely decorated interior and a lovely red façade with three rosettes, which will definitely catch your eye.
There is a statue of Pope John XXIII, who was the Apostolic Delegate to Turkey, in front of the church. The church offers masses in 4 languages, including Italian and English.
Check the official website for the times of the masses.
Wikipedia https://en.wikipedia.org/wiki/Church_of_St._Anthony_of_Padua,_Istanbul
Official Website http://www.katolikkilisesi.org/
Email info@sentantuan.com
Phone +90 212 244 0935
Address Istiklal Cad. No: 171 A, Tomtom Mah., 34433 Beyoğlu − Istanbul, Turkey
Coordinates 41°1'56.237" N 28°58'37.743" E