Küçük Hasan Pasha Mosque, Ottoman mosque at Old Venetian Port, Chania, Greece.

Küçük Hasan Pasha Mosque is a former prayer house in Ottoman style at the eastern end of Chania's old harbor district. The building features a large central dome resting on four stone arches, with six smaller domes covering the spaces around it.

The building was completed in 1645 following the Ottoman conquest of Chania as a tribute to the first Ottoman governor. It served as an active prayer house until the population exchange of 1923 reshaped the region.

The name Yalı Mosque comes from the Turkish yalı, meaning shore, though a Greek folk reading links it to yallie, rich. The building was designed by an Armenian architect who also built a similar mosque at Spaniakos in Selino. Its courtyard once held palm trees and the tombs of pashas and janissaries; today the restored hall hosts events.

The former mosque stands on the eastern side of Chania's old harbour, beside the Venetian harbour front. It is now a municipal exhibition hall; entry is from the harbour side. The prayer hall is a single square room under the central dome, with the six-domed arcade along the west and north sides. The minarets were demolished in 1939, so the roofline is domes only.

The Greek name Yalı Mosque comes from the Turkish yalı, which the Greek source glosses as "rich" rather than "shore". The building is attributed to an Armenian architect who also built a similar mosque in Spaniakos, Selinou. Its courtyard once held palm trees and the tombs of pashas and janissaries.