Grand Hotel Traian, Neoclassical historic hotel in central Iași, Romania.

Grand Hotel Traian occupies a prominent position at Unirii Square, featuring a metal frame structure with cast iron columns and metal platforms. The building contains 68 rooms of varying types, conference spaces, and a ground-floor restaurant.

Scarlat Pastia, mayor of Iași from 1877 to 1879, demolished his shops on Unirii Square to build a national theater, but the project was abandoned. Impressed by Eiffel's Ungheni bridge, he commissioned Gustave Eiffel, whose firm built the present structure between 1879 and 1882. Construction debts ruined Pastia, and he ceded the building to Creditul Urban, which turned it into a hotel.

The building hosted the 21st-anniversary banquet of the Junimea literary society in 1884 and the centenary of the Horea, Cloșca and Crișan revolt on 21 October 1884, attended by Mihai Eminescu and Ion Creangă. In 1918 the Romanian government briefly operated from here. Greta Garbo stayed on 12 July 1934 under a false name.

The building sits centrally at Unirii Square and is easily accessible on foot from downtown locations. Note that it operates as an active hotel, so public areas like the lobby and restaurant are accessible during business hours.

The structure ranks among the earliest examples of metal frame architecture in Romania, showcasing advanced construction techniques from the 1800s. The use of cast iron and metal framework was innovative for its time and changed how buildings were constructed in the region.