This is from my old blog, the Geekie Hellenist. Enjoy.
This is the only prayer to Hercules. I got it from the book ‘In Praise of Olympus: Prayers to the Greek Gods’ by Hearthstone. I hope this helps.
Prayer to Hercules
Hercules, mighty son of thundering Zeus and incomparable Alcmene, father of wise kings and great heroes, clever one, courageous one; Heracles, defender of the children of men, your shrines and temples stood throughout the land in times of old, your name was lauded in prayer, your deeds proclaimed in story and song.
Never has your fame been forgotten, O Heracles; as your tales are told and retold, as each generation learns anew of your legend, your glory grows, your honor increases. Kind Heracles, brave one, strong one, constant friend of man, I praise and honor you.