Donald Cargill (1619 – 27 July 1681) was a Scottish Covenanter who worked to uphold the principles of the National Covenant of 1638 and Solemn League and Covenant of 1643 to establish and defend Presbyterianism.
On 22 June 1680 Cargill's associate Richard Cameron issued the Sanquhar Declaration, calling for war against King Charles II and the exclusion of his brother, afterwards James VII, from the succession. After Cameron's death in July at the hand of dragoons, Cargill continued to preach in the Torwood near Stirling and in September pronounced the sentence of excommunication against the key government figures who were persecuting the Covenanters.
Eventually Cargill was arrested, sentenced to death and hanged in Edinburgh on 27 July 1681. He is reported to have said to the crowd, "The Lord knows I go on this ladder with less fear and perturbation of mind, than ever I entered the pulpit to preach."