Johann III

Johann III may refer to:


 * Johann III, Count of Sponheim-Starkenburg (c. 1315 – 1398)
 * Johann III, Burgrave of Nuremberg (c. 1369 – 1420)
 * Johann III, Duke of Cleves (1490–1538/9)
 * Johann III Bernoulli (1744–1807)