Su-ngai Padi (Thai: สุไหงปาดี, pronounced [sū.ŋǎj pāː.dīː]) is a district (amphoe) in Narathiwat province, Thailand.

Neighboring districts are (from the north clockwise): Cho-airong, Tak Bai, Su-ngai Kolok, Waeng, Sukhirin, and Ra-ngae.

The district is divided into six sub-districts (tambons), which are further subdivided into 50 villages (mubans).

There are a further six tambon administrative organizations (TAO).

This Narathiwat Province location article is a stub.