Phumtham Wechayachai MPCh MVM (Thai: ภูมิธรรม เวชยชัย, RTGS: Phumtham Wetchayachai, pronounced [pʰūːm.tʰām wêːt.tɕʰá.já.tɕʰāj]; born 5 December 1953) is a Thai politician who served as acting Prime Minister of Thailand from 14 to 16 August 2024, following the dismissal of Srettha Thavisin.

[2] Phumtham was born on 5 December 1953 native to Phra Nakhon district, Bangkok.

Returning to politics, Phumtham served as Secretary-General and Deputy Leader of Pheu Thai Party from 2012 to 2023.

On 28 April 2024, Phumtham was appointed Acting Minister of Foreign Affairs after the resignation of Parnpree Bahiddha-nukara.

[3] On 14 August 2024, Phumtham was appointed acting Prime Minister of Thailand following the dismissal of Srettha Thavisin by the Constitutional Court.