Wat Phet Samut Worawihan (Thai: วัดเพชรสมุทรวรวิหาร) or popularly known as Wat Ban Laem (วัดบ้านแหลม) is an ancient Thai Buddhist temple in Mahā Nikāya sect of Samut Songkhram Province.

It was built in the Ayutthaya period during the King Prasat Thong's reign under the name "Wat Si Champa" (วัดศรีจำปา).

According to royal chronicles, Ava troops attacked Phetchaburi in 1764, causing Ban Laem villagers from the area to flee here.

[1] The principal Buddha image of the temple named "Luang Por Ban Laem" (หลวงพ่อบ้านแหลม), which is Buddha image carrying alms posture, approx 167 cm high (5 ft 5 in), presumably built in the Sukhothai–early Ayutthaya periods.

Luang Por Ban Laem is regarded as one of the most sacred Buddha images and is highly respected by Buddhists both domestics and outsiders.