Phetracha (alternative spellings: Bedraja, P'etraja, Petraja, Petratcha; also called Phra Phetracha; Thai: เพทราชา, pronounced [pʰêːt.rāː.t͡ɕʰāː]; 1632– 5 February 1703) was a king of the Ayutthaya Kingdom, usurping the throne from his predecessor King Narai and originally settled in Phluluang Village.

His reign was marred by rebellions, insurrections and political upheavals throughout due to the nature of his ascension to power, especially those claiming ties of loyalty to the previous dynasty, as well as to the late King Narai himself.

Although Thai historians recorded that Phetracha was not interested in being King, Jesuit missionaries stated otherwise, that he was an ambitious man.

While this matter is ambiguous, it is generally agreed that he was a very influential figure in that period, harboring respect from many officers.

It is also said that he strongly believed in Buddhism, thus gaining support from many monks, who feared Ayutthaya kingdom was being converted to Christianity.

When the royal palace at Lopburi was finished, King Narai would stay there for many months in a year, leaving Phetracha as regent to take care of matters in Ayutthaya.

Further questioning of Phaulkon revealed a plot to raise a rebellion, and he too was executed by Phetracha's adopted son Luang Sorasak on 5 June.