The three men volunteering with the Kurdish People's Protection Units (YPG) appear to be the first foreign volunteers to have died since fighting began inside the northern Syrian city.
In a statement on its website, the YPG said Americans Robert Grodt and Nicholas Warden and Briton Luke Rutter were among six "martyrs" on the Raqa front, without saying where exactly they died.
In tweets today, the YPG said Rutter and Warden were "martyred in action" on July 5 and Grodt died the following day.
On November 5, 2016, the SDF launched an offensive dubbed "Wrath of the Euphrates" to retake Raqa, and after months of fighting in the surrounding province, they entered the city in June for the first time.
In a video posted by the YPG on Twitter, Rutter appeared on camera in military fatigues, holding a gun, and said he had received training and Kurdish language lessons since arriving in Syria in March this year.
"I lied to people I care about to come here," he said.
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