Nuruosmaniye Mosque is a historic mosque located in Istanbul, Turkey. It was built in the mid-18th century during the reign of Ottoman Sultan Mahmud I and is named after him. The mosque is in the Nuruosmaniye neighbourhood of Istanbul, near the Grand Bazaar and the Nuruosmaniye Library.

Nuruosmaniye Mosque is known for its unique architectural style, which blends elements of Ottoman and European Baroque styles. The mosque is built in the shape of a cross, with four large domes and four smaller domes surrounding the central prayer hall. 

The mosque's exterior is adorned with intricate decorations, including marble columns, arches, and reliefs. The mosque's interior is also decorated with beautiful tiles, chandeliers, and other decorative elements.

Nuruosmaniye Mosque is an important cultural and architectural landmark in Istanbul and is a popular tourist attraction. It is also an important religious site for Muslims, as it is one of the city's largest and most important mosques. The mosque is open to visitors and is a place of worship for the local community.