Dienekes or Dieneces () was a Spartan soldier who fought and was killed at the Battle of Thermopylae at 480 BC. He was acclaimed the bravest of all the three hundred Spartiates selected to fight in that battle. Herodotus related the following anecdote about Dienekes: Herodotus also mention that Dienekes said many other similar things which made him unforgotten. In his honor, the street on the left of the empty tomb (κενοτάφιο) of King Leonidas I in Sparta is named after him.