Jonathan Peter Jackson (June 23, 1953 – August 7, 1970)[1] was an American militant activist who died of gunshot wounds sustained during an armed invasion of the Marin County Civic Center.

At age 17, Jackson overpowered a Marin County courtroom at gunpoint, taking Superior Court Judge Harold Haley, prosecutor Gary W. Thomas, and three jurors hostage.

In the ensuing shootout, Jackson and Judge Haley were killed, along with two inmates already in the courtroom, who had readily joined the attack; prosecutor Thomas was paralyzed and one juror was seriously injured.

[4] On August 7, 1970, Jackson brought a satchel containing three firearms, registered to Davis,[7] into the Marin County Hall of Justice, where Judge Haley was presiding over the trial of San Quentin inmate James McClain.

[12] A monument on the premises to Judge Haley was the target of a follow-up attack perpetrated by the Weather Underground terrorist network in October of the same year.