Sainkhuugiin Ganbaatar (; born 30 July 1970) is a Mongolian politician, who was elected to the State Great Khural three times from 2012 to 2016 and from 2020 to present.
He served as an Independent member of the State Great Khural from 2012 to 2016. He joined the National Labour Party (currently known as the HUN Party) and briefly served as its party chairman from January 2016. He left the National Labour Party in May and ran as the "United Coalition of Patriots"' candidate for the 2016 parliamentary election. He lost his re-election in the 43th Darkhan-Uul Constituency.
He would later join the Mongolian People's Revolutionary Party (MPRP) and became the MPRP's nominee for President of Mongolia in the 2017. He ranked 3rd place and received 30.61% of the popular vote. Despite his significant performance in the first round, Ganbaatar was narrowly eliminated out of the race, falling short of the MPP candidate Miyeegombyn Enkhbold by just 0.14%.
Ganbaatar was elected again to the State Great Khural in the 2020 parliamentary election, becoming the only politician from the Our Coalition to win a parliamentary seat. However, he would leave the MPRP in April 2021, following their merger with the ruling Mongolian People's Party and joined the opposition Democratic Party. He was re-elected to parliament in the 2024 parliamentary election.