Boris Rhein (born 2 January 1972) is a German lawyer and politician of the Christian Democratic Union (CDU) who has been serving as Minister-President of Hesse since 2022.

Rhein was appointed a Staatssekretär in the Hessian State Ministry of Justice in 2009, but was soon promoted to Staate Minister of the Interior when the CDU-politician Volker Bouffier became the Minister-President of Hesse.

[1] His tenure was perceived as conservative by the German media:[3] he endorsed state data retention and a harsher penal code in cases of violence against police officers.

[6] Even though Rhein was considered a conservative State Minister of the Interior, he rejected this description of his tenure by saying that the office required a rigid enforcement of the law.

Citing sources within the party, Süddeutsche Zeitung writes that Rhein had acquired a more centrist profile in the aftermath of his defeat in the 2012 Frankfurt mayoral election.