"My thoughts, and those of Australians, are with the Princess of Wales and her family following the news of her cancer diagnosis," he posted on X, formerly known as Twitter, on Saturday.
Mr Albanese said the Princess showed "extraordinary courage" with her public statement, in which she expresses her concern for others.
"We are sending support and strength in this difficult time as she undergoes treatment, and we wish her well for a speedy recovery."
My thoughts, and those of Australians, are with the Princess of Wales and her family following the news of her cancer diagnosis. — Anthony Albanese (@AlboMP) The Princess of Wales has shown extraordinary courage with her public statement today, in which she expresses her concern for others.March 22, 2024
Princess Catherine revealed the news in a video message at 6pm local time (5am AEDT), saying the diagnosis was a "huge shock".
The 42-year old mother of three said she was told she had cancer after undergoing abdominal surgery nine weeks ago at the private London Clinic.
"The surgery was successful," she said in the video message.
"However, tests after the operation found cancer had been present.
"My medical team therefore advised that I should undergo a course of preventive chemotherapy and I am now in the early stages of that treatment."
The news comes after weeks of speculation about the royal's health.
A message from Catherine, The Princess of Wales — The Prince and Princess of Wales (@KensingtonRoyal) pic.twitter.com/5LQT1qGarKMarch 22, 2024
"This of course came as a huge shock, and William and I have been doing everything we can to process and manage this privately for the sake of our young family," Princess Catherine said in the video message.
"As you can imagine, this has taken time. It has taken me time to recover from major surgery in order to start my treatment.
"But, most importantly, it has taken us time to explain everything to George, Charlotte and Louis in a way that is appropriate for them, and to reassure them that I am going to be OK."
King Charles praised his daughter-in-law's courage and said two remained close, in a statement issued shortly after the announcement.