Cindy Lee Sheehan (née Miller; born July 10, 1957) is an American anti-war activist, whose son, U.S. Army Specialist Casey Sheehan, was killed by enemy action during the Iraq War. She attracted national and international media attention in August 2005 for her extended antiwar protest at a makeshift camp outside President George W. Bush's Texas ranch—a stand that drew both passionate support and criticism. Sheehan ran unsuccessfully for Congress in 2008. She was a vocal critic of President Barack Obama's foreign policy. Her memoir, Peace Mom: A Mother's Journey Through Heartache to Activism, was published in 2006. In an interview with The Daily Beast in 2017, Sheehan continued to hold her critical views towards George W. Bush, while also criticizing the militarism of Donald Trump.

Sheehan was the 2012 vice presidential nominee of the Peace and Freedom Party alongside Roseanne Barr, and received 1.2% of the statewide vote in the 2014 California gubernatorial primary election.

Cindy Sheehan was born Cindy Lee Miller in Inglewood, California, in 1957. Her father worked at the Lockheed Corporation while her mother raised her family. Sheehan graduated with honors from Cerritos College and studied history at UCLA. She worked as a youth minister at St. Mary's Catholic Church in Vacaville, California for eight years, and also coordinated an after-school program for at-risk middle school children for the City of Vacaville.

Casey Austin Sheehan (May 29, 1979 – April 4, 2004) was a specialist in the United States Army who was killed during combat action while serving in the Iraq War.

In May 2000, Casey Sheehan enlisted in the United States Army as a light-wheeled vehicle mechanic, MOS 63B. It has been reported that he may have considered enlisting as a chaplain assistant MOS 56M. (Sheehan had acted as an altar server during the Palm Sunday mass on the morning of his death).

Near the end of his active service, the 2003 invasion of Iraq began. Sheehan reenlisted, knowing that his unit would be sent there. Sheehan's division, the First Cavalry Division, was sent to Iraq. On March 19, 2004, Sheehan's Battery C, 1st Battalion, 82nd Field Artillery Regiment, arrived at FOB Camp War Eagle in Sadr City. On April 4, 2004, Sheehan was killed in action after volunteering to be part of a Quick Reaction Force to rescue American troops in the "Black Sunday" incident that began the Siege of Sadr City.

Casey Sheehan is buried in Vacaville-Elmira Cemetery in Vacaville, California. In May 2006, the tombstone that Casey's family had been designing and commissioned was finally ready and placed at Casey's grave. Cindy Sheehan paid for the tombstone herself, which is normally the case, stating, "It is important for the rest of Casey's family to have one.... I guess the pain of seeing it etched in marble that he is dead is another pain I will have to deal with." Cindy Sheehan maintains that the U.S. government "should have paid for it because of its responsibility for his death." The Sheehan family did not want the furnished monument that the government provides because it didn't reflect Casey's entire life or personality.

Casey Sheehan was awarded the Purple Heart and Bronze Star with V for Valor posthumously for his actions April 4, 2004. The chapel at Fort Hood started a new Knights of Columbus chapter that was named the Specialist Casey Austin Sheehan Council.