Jacka), named after Saint Hyacinth of Poland, is a Baroque Catholic church building located in Warsaw's New Town at Freta Street 8/10.

[2] The ornate baroque building was constructed according to the design by prominent Warsaw architect Tylman Gamerski.

[2] During World War II, the church and monastery served the Polish forces in the Warsaw Uprising as a field hospital.

Among them, the most interesting are the tomb monuments - the mannerist tomb of Katarzyna Ossolińska, constructed in 1607 (it was only partially reconstructed); the tomb of Anna Tarnowska, carved from brown Chęciny marble in about 1616, which depicts Anna in the typical Polish sepulchral art sleeping pose; the black marble epitaph of Regina Sroczyńska, a wealthy merchant from Kraków, originally adorned with a coffin portrait of Regina painted on tin plate.

[2] Next to the sanctuary there is a chapel for St. Dominic with the most valuable element of the church's furnishing - an 18th-century wooden statue of Ecce Homo by Antoni Osiński, with profuse stucco decorations, a black marble altar and a portal.