The Roman emperor as Jupiter (Zeus), 2nd century AD. Found next to the stadium in Isthmia.
Zeus (Jupiter) is, of course, the king of the gods and the son of Kronos (Saturnus). He's, however, not the most common god to be found in sculpture, even thou you'll see him from time to time - you might compare this with the fact that he has no major temples on any city acropolis and only a few festivals in his honour.
Zeus can be recognized by several traits: he's always bearded and you'll normally find him sitting quietly on a throne with a sceptre in his hand (probably on the model of Pheidias statue). You can also find him flanked by an eagle from time to time.
Other statues of Zeus:
Zeus and Ganymede
A throned Zeus with Cerberus (This is however most likely a Serapis in original, a god closely connected to Zeus).
Upper body of Zeus