Margaret ruins in Veszprém, Church ruin in Dózsaváros, Veszprém, Hungary.

Margaret ruins are the remains of the Dominican convent of Saint Catherine, founded in 1240 by Bishop Bertalan, on Margit Square in the Dózsaváros district of Veszprém, by the Séd Brook. The 13th-century church had a long nave and a straight-ended chancel, and its northern late-Gothic chancel wall still stands tall, marked by a large wooden cross. The southern part of the complex disappeared and houses were built over it, while gardens and modern houses occupy much of the convent area.

Bishop Bertalan of Veszprém founded the convent with its church in 1240, for Dominican nuns who had arrived in Hungary in the 1220s. Saint Margaret, daughter of King Béla IV, lived here from 1246 to 1252 before moving to the Island of Rabbits. Blessed Ilona of Hungary, a stigmatized nun, is named as her teacher.

The ruins take their popular name from Saint Margaret, daughter of King Béla IV, who lived here from 1246 to 1252 before moving to the Island of Rabbits, today Margaret Island in Budapest. The district around the convent later adopted its patron saint's name and was called Szentkatalinszeg. The other noted resident was the stigmatized Blessed Ilona of Hungary, mentioned as Margaret's teacher.

The ruins stand on Margit tér in the Dózsaváros district, on the bank of the Séd, below the castle hill; from the castle the convent remains are visible in the valley. The southern part of the complex has vanished under later houses, so the surviving north side, including the high late-Gothic sanctuary wall marked by a large wooden cross, is what can be seen. Much of the convent area is now gardens and modern houses, and the ruin is a protected monument.

Excavations in the 1930s uncovered the precise ground plan of the complex, including a single-naved church and additional buildings. These archaeological discoveries allow visitors today to imagine the original structure of the monastery through its foundation outlines.