“Only players registered as female at birth will be allowed to participate in matches,” the Irish Rugby Union Federation announced on Wednesday.
Ireland notably joins the decision of English rugby union and rugby league, which last month banned transgender players from taking part in women's competitions, for safety reasons.
The rule change will only affect two players registered in Ireland, the IRFU said it has contacted them to offer them alternative means, such as forms of non-contact play, refereeing and training.
Being born male, a sporting advantage
Recent research shows that there are physical differences between people whose sex was assigned as male or female at birth.
"The strength, endurance and physical benefits brought on by male puberty are significant and continue even after testosterone is removed," the Irish Rugby Football Union (IRFU) said in a statement.
Read alsoRugby League prohibits transgender people from playing women's matches
“Transgender women have been excluded from women's rugby due to the size, strength and power benefits conferred by testosterone during puberty and adolescence, and the resulting risks to player well-being.
“IRFU is fully aware that this is a sensitive and difficult area for those involved and the wider LGBT+ community and will continue to work with those affected, providing support to ensure their continued involvement. in the game. "