MLB launched a probe in June 2021 after a woman accused the Cy Young winner of going too far during two sexual encounters in April and May 2021 ... allegedly punching and choking her unconscious ... resulting in bumps, bruises, scratches and other injuries.

The league concluded after an extensive investigation, he did, in fact, violate the league's joint policy on domestic violence, sexual assault and child abuse.

Bauer -- who has adamantly denied any wrongdoing -- says he will appeal the punishment and expects to win.

"In the strongest possible terms, I deny committing any violation of the league's domestic violence & sexual assault policy," Bauer said in a statement.

"I am appealing this action and expect to prevail. As we have throughout this process, my representatives & I respect the confidentiality of the proceedings."

Bauer's suspension comes two months after it was determined he would not face criminal charges over the allegations.

"After a thorough review of all the available evidence, including the civil restraining order proceedings, witness statements and the physical evidence, the People are unable to prove the relevant charges beyond a reasonable doubt," the district attorney said at the time.

Bauer went on to sue his accuser and her attorney ... claiming she fabricated her accusations in order to ruin his career and extract money from him.

Bauer hasn't pitched since June 2021 ... and if the suspension holds, will be almost 34 when he will be able to step on the mound again.

Bauer is in the middle of a 3-year, $102-million deal ... and was slated to make more than $30 million in 2022 and 2023. In other words, if the suspension holds, he will lose more than $60 million.