In Greek mythology, Euryalus is.

• In the Aeneid, Euryalus and Nisus were considered ideal friends. He died during a raid on the Rutulians. (Virgil V, 294, 334; IX 179, 199, 226, 431)
  
  
  
  
• A son of Mecisteus, is mentioned by Apollodorus (i. 9. § 16) among the Argonauts, and was one of the Epigonoi who took and destroyed Thebes. (Pausanias ii. 20. § 4; Apollod. iii. 7. § 2.) He was a brave warrior, and at the funeral games of Oedipus he conquered all his competitors (Hom. Il. xxiii. 608) with the exception of Epeius, who excelled him in wrestling. He accompanied Diomedes to Troy, where he was one of the bravest heroes in the Trojan War, and slew several Trojans. (Il. ii. 565, vi. 20; Pausanias ii. 30. § 9.) He was one of the Greeks to enter the Trojan Horse. In the painting of Polygnotus at Delphi, he was represented as being wounded; and there was also a statue of him at Delphi, which stood between those of Diomedes and Aegialeus. (Paus. x. 10. §2, 25. § 2.)
  
  
• One of the suitors of Hippodameia. (Pausanias vi. 21. § 7; Schol. ad Pind. Ol. i. 127.)
  
  
  
• A son of Odysseus and Evippe, also called Doryclus or Leontophron, was killed by Telemachus. (Parthen. Erot. 3; Eustath. ad Hom. p. 1796.)

See also HMS Euryalus.