Trump called it "a great honour to sign this".
"They should not have been prosecuted," he said as he signed pardons for "peaceful pro-life protesters".
The people pardoned were involved in the October 2020 invasion and blockade of a Washington clinic.
Lauren Handy was sentenced to nearly five years in prison for leading the blockade by directing blockaders to link themselves together with locks and chains to block the clinic's doors.
A nurse sprained her ankle when one person pushed her while entering the clinic, and a woman was accosted by another blockader while having labour pains, prosecutors said. Police found five fetuses in Handy's home after she was indicted.
President Donald Trump says the anti-abortion activists he pardoned should not have been prosecuted. (AP PHOTO)
Trump pardoned Handy and her nine co-defendants: Jonathan Darnel of Virginia; Jay Smith, John Hinshaw and William Goodman, all of New York; Joan Bell of New Jersey; Paulette Harlow and Jean Marshall, both of Massachusetts; Heather Idoni of Michigan; and Herb Geraghty of Pennsylvania.
In the first week of Trump's presidency, anti-abortion advocates have ramped up calls for Trump to pardon protesters charged with violating the Freedom of Access to Clinic Entrances Act (FACE Act), which is designed to protect abortion clinics from obstruction and threats.
The 1994 law was passed during a time where clinic protests and blockades were on the rise, as was violence against abortion providers, such as the murder of Dr David Gunn in 1993.
Trump specifically mentioned Harlow in a June speech criticising former president Joe Biden's Department of Justice for pursuing charges against protesters involved in blockades.
"Many people are in jail over this," he said in June, adding, "We're going to get that taken care of immediately."
Abortion rights advocates slammed Trump's pardons as evidence of his opposition to abortion access, despite his vague, contradictory statements on the issue as he attempted to find a middle ground on the campaign trail between anti-abortion allies and the majority of Americans who support abortion rights.
The legal group Thomas More Society argued the FACE Act defendants they represent had been unjustly imprisoned.
Republican senator Josh Hawley, among Trump's most loyal supporters, called the prosecution of anti-abortion protesters "a grotesque assault on the principles of this country" and urged Trump to pardon them while reading the stories of such anti-abortion protesters on the Senate floor on Thursday.
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