St. Peter's Bridge, Stone bridge in Ljubljana, Slovenia.

St. Peter's Bridge is an iron and concrete bridge over the Ljubljanica at the northeastern end of Ljubljana's old town, carrying Rozman Street across the river. It links Vraz Square and the Petkovšek Embankment on the left bank with Ambrož Square and the Poljane Embankment on the right bank. It is intended mainly for motorised traffic but is also used by pedestrians.

The current iron and concrete structure was completed in 1918 following delays caused by World War I. It replaced a wooden bridge from 1835 that originally carried draft animals and pedestrians.

The bridge is named after the nearby St. Peter's Church. A legend, unconfirmed by historical sources, holds that Bishop Thomas Chrön (1560–1630) led a procession of the Blessed Sacrament across the wooden footbridge here, guarded from the Lutherans by Ljubljana's blacksmiths; the Chrön Cross on today's Ambrož Square is said to commemorate that victory.

The bridge carries motorised traffic and has pedestrian walkways on both sides. It links Rozman Street with Ambrož Square and Vraz Square, and lies between the Grain Bridge and the Ljubljanica weir. The Ljubljana tram once ran over its wooden predecessor.

The wooden bridge replaced in 1918 was moved to the Prule neighbourhood, where it became the Prule Bridge. The present iron and concrete span was begun in the early 20th century but finished only in 1918 because of World War I.