Organisers of The Hundred say they do not “accept racism or other forms of abuse” following “recent comments directed towards players and fans”.
The Hundred is a new cricket competition which started on Wednesday.
A statement from organisers on the social media abuse in recent days said: “Sadly, we have witnessed these unacceptable behaviours online.
“We stand together with the rest of cricket against all forms of discrimination.”
It added: “You can disagree with us on many things, but not on that. Those who do are not welcome here.”
West Indies all-rounder Carlos Brathwaite, who plays for Manchester Originals in The Hundred, has posted on social media criticising “these keyboard warrior racists”.
England bowler Liam Plunkett plays for Welsh Fire and also spoke about online criticism “if you have a bad day at the office”.
The Hundred is run by the England and Wales Cricket Board and has matches involving men’s and women’s teams.
The abuse is among many recent incidents, including Formula 1 driver Lewis Hamilton being the target of racism on social media after his victory at his home British Grand Prix.
England footballers Marcus Rashford, Jadon Sancho and Bukayo Saka were also targeted with racist abuse on social media after they all missed a penalty in the Three Lions’ Euro 2020 final shootout defeat against Italy.
A mural honouring Manchester United striker Rashford was also defaced, though it was repaired the next day and later covered with hundreds of messages of support.