This list of peace activists includes people who proactively advocate diplomatic, non-military resolution of political disputes, usually through nonviolent means.

A peace activist is an activist of the peace movement.

Uri Avnery (Hebrew: אורי אבנרי‎, also transliterated Uri Avneri, born 10 September 1923) is an Israeli writer and founder of the Gush Shalom peace movement.

A member of the Irgun as a teenager, Avnery sat in the Knesset from 1965–74 and 1979–81. He was also the owner of HaOlam HaZeh, an Israeli news magazine, from 1950 until it closed in 1993.

He is famous for crossing the lines during the Siege of Beirut to meet Yassir Arafat on 3 July 1982, the first time the Palestinian leader ever met with an Israeli. Avnery is the author of several books about the Israeli-Palestinian conflict, including 1948: A Soldier’s Tale, the Bloody Road to Jerusalem (2008); Israel’s Vicious Circle (2008); and My Friend, the Enemy (1986).

Avnery was born in Beckum, Germany as Helmut Ostermann, to a well-established German Jewish family. Avnery and his family emigrated to Palestine in 1933, following Adolf Hitler's rise to power. He attended school in Nahalal and then in Tel Aviv, leaving after 7th grade, at age 14, in order to help his parents. He started work as a clerk for a lawyer, a job he held for about five years.

Carlos Arredondo (born 1960) made national news when his son Marine Lance Corporal Alexander Arrendondo, 20 years old, was killed in An Najaf, Iraq during his second tour of duty in Operation Iraqi Freedom on August 25, 2004. Later that day, on Carlos Arredondo's 44th birthday, the Marines' Casualty Assistance Team arrived at the Arredondo home in Hollywood, Florida to notify him of his son's death. The Marines had not brought a chaplain with them and notified him in the front yard of his home. After close to 30 minutes during which Mr. Arredondo requested for the Marines to leave, he became extremely upset and agitated. According to Arrendondo's account, at this point he called his son's Marine recruiter on the phone:

"My head full of confusion, asking myself what's going on, what's going on, I pounded the hammer hard into the ground, then went behind a tree to cry when I think to call Alex's recruiter, Sergeant Martinez. I have his telephone number in my phone. I call him, explain that I'm Alex's father and ask him to please help me, the Marines are telling me Alex has died. The voice on the other side say, "Sir, sir, you've got the wrong number. I look and the phone say "Sergeant Martinez." Pretty sure it was Sergeant Martinez's voice. I call him back again, and again he hung up on me."

Margaretta Ruth D'Arcy (b. 1934), an Irish actress, writer, playwright, and peace-activist. Margaretta is a member of Aosdána since its inauguration and is known for addressing Irish nationalism, civil liberties, and women's rights in her work.

Margaretta was born in London to a Russian Jewish mother and an Irish Catholic father. D'Arcy worked in small theatres in Dublin from the age of fifteen and later became an actress. Married in 1957 to English playwright and author John Arden, they frequently collaborate. They settled in Galway and established the Galway Theatre Workshop in 1976. The couple has written a number of stage pieces and improvisational works for amateur and student players, including The Happy Haven (1960) and The Workhouse Donkey. She has written and produced many plays, including “The Non-Stop Connolly Show”.

Margaretta D'Arcy has written a number of books, including Tell Them Everything, Awkward Corners (with John Arden), and Galway's Pirate Women: a global trawl.

As an activist she joined Bertrand Russell's anti-nuclear Committee of 100 in 1961.

Raymond McGovern (born 1939) is a retired CIA officer turned political activist. McGovern was a Federal employee under seven U.S. presidents over 27 years, presenting the morning intelligence briefings at the White House for many of them.

McGovern has been an outspoken commentator on intelligence-related issues since the late 1990s. He was heavily critical of the government's handling of the Wen Ho Lee case in 2000. In 2002 he was publicly critical of President George W. Bush's use of government intelligence in the lead-up to the war in Iraq.

In 2003, together with other former CIA employees, McGovern founded the Veteran Intelligence Professionals for Sanity or VIPS. The organization is dedicated to analyzing and criticizing the use of intelligence, specifically relating to the War in Iraq. In January 2006, McGovern began speaking out on behalf of the anti-war group Not in Our Name. According to the group's press release, McGovern served symbolic "war crimes indictments" on the Bush White House from a "people's tribunal."