Bad Griesbach im Rottal (Central Bavarian: Bad Griasboch im Rottoi), or just Bad Griesbach, is a town in the district of Passau in Bavaria in Germany.

"Burg Griesbach" is first mentioned in a document from around 1076. The place was part of Landshut. It was raided and destroyed by an army from the Electorate of the Palatinate in 1504, only to be re-erected soon afterwards. In 1778/79 Griesbach was occupied by Austrian forces. As part of the Dukedom Bavaria, Griesbach im Rottal (official name) became more independent. In 1953 it was officially turned into a town (Kleinstadt).

The Bavarian reform of 1972 merged the municipalities of Karpfham, Parzham, Reutern, St. Salvator and Weng. The discovery of hot springs in 1972/73 lead to a new orientation as a spa town.

The mayor is Jürgen Fundke, he was elected in 2008 with 58% of the votes and re-elected in 2014 and 2020. He is the successor of Robert Erdl (CSU). The predecessors were Konrad Ebner (CSU) and Edmund Mitzam.

• The Holy Conrad of Parzham (born Johann Birndorfer) was born on December 22, 1818, in the hamlet Parzham, (died 1894), since 1977 Konrad is the patron saint of Bad Griesbach
• Josef Altstötter (1892-1979), lawyer, secretary of state in the ministry of justice and war criminal, was born in Griesbach
• Franz Beckenbauer (1945–2024), football player and manager, is, together with the bathroom pioneer Alois Hartl, since 2003 honorary citizen of Bad Griesbach.

Bad Griesbach (Rottal) is twinned with:

• Friesach, Austria