Prince Alfred College in Adelaide, an elite all-boys private school established in 1869, will allow Alice, a transgender student who has transitioned, to continue her studies.

Headmaster Bradley Fenner advised parents of the news on Tuesday, following a school assembly where Alice spoke about her situation to the 150 students in her grade.

"I thought it was very powerful when she spoke to her peers — to the other year 12 students — on Tuesday," Mr Fenner said. "She made the point that 'this is who I am' and 'this is who I have always been', so it's not a transition as it might appear to be but very much a statement of who she is."

"Overall, we've been really pleased with the response; the boys have been very respectful and supportive," he said. "She's had some great messages from amongst the student body and staff and the wider community as well."

"We have a commitment to diversity and inclusiveness, and those things cannot just be words on the page," he said.

Cover Photo: Prince Alfred College Adelaide