John Sokol of Lamberg (c. 1355 – 28 September 1410) was a military leader from Moravia who became known during the internal disputes of members of the Luxembourg dynasty and from his participation of the Battle of Grunwald.

After the intervention of Margrave Jobst of Moravia, and promises of not harassing the land again, the new bishop Jan XI Mráz [cs] lifted the excommunication in 1403.

Together with men such as Jan Žižka, Matthew the Leader, and Racek Kobyla, he waged a guerilla campaign against the Rosenberg family, enemies of Wenceslas.

John Sokol was named provincial governor, and counted Henry III of Rosenberg, Sigismund of Luxembourg, and Albert II of Germany among his enemies.

[2] John Sokol of Lamberg died on 28 September 1410 after a feast in Toruń, to which he was invited by Polish King Władysław II Jagiełło.

Zizka in this rendition had absolutely nothing to do with his poisoning and was devastated by the sudden, surprise loss of his patron, most reliable noble protector and close friend.