Those signing up for the mass participation event at the upcoming London Marathon will be able to register as non-binary for the first time.
The move does not affect elite races, which will continue to operate under male and female categories and have their prizes divided up as such.
This is because it follows rules set by World Athletics, an international governing body for certain sports.
Despite this, director Hugh Brasher described it as a “significant step” towards equality.
“Changes such as this demonstrate our commitment to making the London Marathon for everyone,” he continued.
This year’s event saw more than 350,000 people apply to run, with 2021’s seeing 80,000 getting involved either virtually or in person.
The 2023 event will see the London Marathon return to its typical springtime slot for the first time in four years.
It is currently scheduled to take place on Sunday 23 April.
Earlier this week, the Boston Marathon announced plans to offer athletes the chance to take part without having to register in either the men’s or the women’s divisions from 2023.
“Discussions are ongoing with nonbinary athletes in an effort to further promote inclusion at all BAA events,” said a statement from the Boston Athletic Association (BAA).