Mariusz Kamiński (born 25 September 1965) is a Polish politician who served as the head of the Central Anticorruption Bureau (CBA) from August 2006 to October 2009.

Rejoining Law and Justice in 2011, he continued to hold influential party and governmental positions, including being re-elected to the parliament multiple times, the last being in 2023.

Kamiński's political career has also been marked by allegations of abuse of power, particularly in relation to the preparations for the 2020 presidential elections, which led to an investigation by the Supreme Audit Office.

On 6 October 2009 Mariusz Kamiński faced charges by the Regional Prosecutor's Office in Rzeszów, accused of exceeding his powers and committing offences against the credibility of documents, including falsifications related to a "land scandal."

In January 2024, Mariusz Kamiński was arrested at Poland's Presidential Palace due to a two-year jail sentence handed down by a Warsaw court in December 2023.

Subsequent investigations into Kamiński's actions while under a ban from public office led to further charges in April 2024, highlighting ongoing legal and political disputes surrounding his career.

Kamiński was previously married to Anna Kasprzyszak, a Polish journalist and opposition activist who also served as an advisor to President Andrzej Duda.