Simon Bramhall, 53, seared his initials on a patient's liver after conducting a hard transplant in a "naive and foolhardy" attempt to relieve tension, a court heard.
The Crown Prosecution Service (CPS) said he used a medical instrument called an argon beam coagulator - which seals bleeding blood vessels by directing a beam of electricity on to the area - to inscribe two patients' livers as they were under general anaesthetic.
Bramhall resigned from his job at Birmingham's Queen Elizabeth Hospital after another surgeon found "SB" branded on a failed donor liver in 2014.
He said: "I accept that on both occasions you were exhausted and stressed and I accept that this may have affected your judgement.This was conduct born of professional arrogance of such magnitude that it strayed into criminal behaviour". I accept that on both occasions you were exhausted and stressed and I accept that this may have affected your judgment.
"He knew that the action could cause no harm to the patient".
Prosecutor Tony Badenoch QC said one of the victims, referred to in court as Patient A, received a donor organ in 2013 in a life-saving operation carried out by Bramhall.
The offence of assault by beating was brought against the consultant surgeon to reflect the act of marking the liver and there is no suggestion he was responsible for physically "beating" either patient.
A surgeon who branded his initials into patients' organs has been fined £10,000 (AU$17,000).
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One of Bramhall's branded patients, an unnamed woman, wrote a victim impact statement shared during the sentencing hearing, The Mirror reports.
A nurse who witnessed the surgeon's actions said she had asked him what he was doing; he is said to have replied: "I do this". This was conduct born of professional arrogance of such magnitude that it strayed into criminal behavior.
"It was Mr Bramhall who gave me my first instincts of hope", Barbara Moss explained. I think it should have been thrown out.
He took a photo of it but did not initially report the incident, thinking it was a one-off.
He told police it had been a misguided attempt to relieve the tension in the operating theatre.
He also entered a guilty plea relating to an operation performed on an unknown patient in February of the same year.
The University Hospitals Birmingham NHS Foundation Trust said: "The Trust is clear that Mr Bramhall made a mistake in the context of a complex clinical situation and this has been dealt with via the appropriate authorities, including the Trust as his then employer".