Ban Phaeo (Thai: บ้านแพ้ว, pronounced [bâːn pʰɛ́(ː)w]) is a district (amphoe) in the northern part of Samut Sakhon province, central Thailand.

Hunters who traveled to hunt wild animals there always lost their way, so they agreed to make meeting points by using phaeo flags.

In early November 2020, an almost perfectly preserved skeleton of a Bryde's whale was discovered in Amphaeng tambon in Ban Phaeo district.

[2] The National University of Singapore said that the skeleton added to evidence of significant sea level changes around 6,000 to 3,000 years ago in the Bay of Bangkok.

In addition, Ban Phaeo is also the largest breeding place for snakeskin gourami fish in the country.