Nvidia is at the heart of ongoing US-China tensions in the semiconductor industry.
Regulators in China said US chip giant Nvidia broke its antitrust laws, following a preliminary investigation.
The State Administration for Market Regulation said in a Monday statement that Nvidia violated anti-monopoly laws, but it did not elaborate further in a brief statement.
The regulator also said it suspected Nvidia of violating commitments made during its 2020 acquisition of Israeli chip designer Mellanox, which Beijing had conditionally approved.
"The State Administration for Market Regulation decided to conduct further investigation into it in accordance with the law," the regulator said.
Nvidia is at the heart of ongoing semiconductor industry tensions between the US and China.
US export controls had restricted Nvidia from selling its H20 chips to China.
Nvidia could not immediately be reached for comment