The Quarry Bay Monster Building is a residential complex located in Quarry Bay, Hong Kong. It is also known as the Yik Cheong Building or the Montane Mansion. The building was built in the 1960s and has become a popular tourist attraction in Hong Kong due to its unique appearance.

The building consists of five interconnected buildings that are each 12 to 16 stories tall. The buildings are arranged in a way that creates a maze-like structure with narrow alleys and staircases. The exterior of the building is made up of hundreds of identical rectangular windows, giving it a uniform and repetitive appearance.

The Quarry Bay Monster Building has been featured in several movies and TV shows, including the popular Hong Kong film "Love in a Puff". It has also been used as a backdrop for fashion shoots and advertisements.

Despite its popularity, the building has been criticized for its cramped living conditions and lack of proper ventilation. The Hong Kong government has designated the building as a Grade II historic building, which means that it cannot be demolished or altered without special permission.