Ao Manao (Thai: อ่าวมะนาว), meaning "Lime Bay", is a bay in the west side of the Gulf of Thailand. It is five kilometres to the south of Prachuap Khiri Khan in Prachuap Khiri Khan Province.
Ao Manao (อ่าวมะนาว) Ao Manao was once a battlefield in World War II between the Thai and Japanese armies. It is a clean beach suitable for swimming. Opposite the beach stands Khao Lom Muak. At ebb tide, a long sand bar will appear. At the summit of Khao Lom Muak, there is a replica of the Buddha’s footprint. Moreover, at the foot of the mountain stands a shrine of Chaopho Khao Lom Muak.