Castle Peak Beach, Public beach in Tuen Mun District, Hong Kong

Castle Peak Beach is a public swimming area in Tuen Mun with a designated zone protected by shark nets to ensure visitor safety. The beach offers enough space for swimming, sunbathing, and other recreational activities along the waterfront.

The beach was originally known as Yung Lung Beach and closed in 1981 due to water quality concerns affecting its safety. It reopened in 2005 after significant improvements were made to the water and facilities.

The beach was long known as Yung Lung Beach before taking the name of the bay it faces. Its 27 barbecue pits and two-storey beach building, built by the Regional Council at a cost of HK$97 million, make it a spot for group outings rather than swimming alone. In 2019 the LCSD counted 176,690 visitors during the bathing season, the fewest of Tuen Mun District's six gazetted beaches.

The beach sits beside Sam Shing Estate, within walking distance of the Sam Shing stop on the Light Rail network, and a franchised bus stop served by Kowloon Motor Bus, Long Win Bus, MTR Bus and Citybus stands next to it. A breakwater separates the swimming area from the Tuen Mun typhoon shelter. The 0.8-hectare swimming zone is enclosed by a shark net installed on 24 May 2005.

In 2019 the LCSD recorded 176,690 visitors during the bathing season, the lowest figure among Tuen Mun District's six gazetted beaches. That same season the beach had the highest mean E. coli levels of all 41 beaches monitored by the Environmental Protection Department, with water quality mostly between Grade 2 (Fair) and Grade 3 (Poor).