Oktogon, pedestrian passage in Donji grad, Zagreb, Croatia

Oktogon is a shopping passage through the former First Croatian Savings Bank building, connecting Petar Preradović Square with Ilica street. It consists of two passageways that meet at a three-storey octagonal hall covered by a stained-glass dome, which gives the passage its name. The floors are laid with square tiles in two colours, framed by borders, one of which carries a meander motif.

Oktogon was built between 1898 and 1900 as part of the First Croatian Savings Bank building, designed by architect Josip Vancaš. Modeled on covered passages in other European cities, it was Zagreb's first covered pedestrian passage, with a central glass dome and stained-glass windows.

The passage served as a gathering point where shopkeepers and residents moved through daily life, connecting different parts of the city. This pedestrian function remains central to how locals and visitors experience the space today.

Oktogon links Petar Preradović Square with Ilica Street at Ilica 5, so it works as a through-route between the two. The floor is laid with square tiles in two colours, bordered by a meander motif. The central hall is three storeys high under a glass dome, and the passage has two entrances.

A small memorial plaque once honored Pluto, a stray dog who kept workers company during the building's construction. Though removed in 2013, locals still remember this unusual tribute to an animal that became part of the site's past.