Wat Pak Nam Fang Tai (Thai: วัดปากน้ำฝั่งใต้) is a Thai Buddhist temple in Bangkok. It is an ancient private temple built since the Ayutthaya period. Its history is unclear, assumed to be built around 1827 or 1880 (corresponds to the King Rama V's reign), and received wis̄ungkhāms̄īmā (วิสุงคามสีมา, "the boundary of the temple was bestowed by the king") in the year 1882.

It is a small and quiet monastery. Lagendarily the temple founders were brothers. Later, there was a misunderstanding, therefore dispersed to build different temples. It became a pair of temples, namely Wat Pak Nam Fang Nuea (วัดปากน้ำฝั่งเหนือ), on the opposite side, with Wat Pak Nam Fang Tai.

Its name meaning "the temple on the southern side of the confluence". Assumed it got this name because of its location near the confluence of Khlong Bang Chueak Nang and Khlong Bang Noi become a Khlong Mon on the southern side. The opposite is the northern side, the location of its counterpart, Wat Pak Nam Fang Nuea.

The pier in front of the temple is sanctum to a large number of iridescent shark. Feeding them with bread or releasing fish for merit are some of the activities that can be done by visitors.