Alkaff Gardens (also known as the Alkaff Lake Gardens and briefly known as Happy Garden from 1940 to 1941) was a Japanese-style park once located east of the Bidadari Cemetery from 1930 to 1964, on the present site of Cedar Girls' Secondary School at Bidadari, Singapore. In the 1930s, the park was a popular leisure destination for dating couples and families. It featured as its centrepiece an artificial lake, which was drained in 1964.