Jonathan Hasek (born ???? - died ????) was one of a pair of twin boys born to House Hasek, the ruling family of New Syrtis in the Capellan March of the Federated Suns. Jonathan and his twin brother Jason were born during the Age of War and both went on to become MechWarriors in the Federated Peacekeeping Forces. Each would ultimately command a regiment of the Syrtis Fusiliers; the two regiments commanded by Jason and Jonathan were founded on the same day, with Jonathan commanding the Fourth Syrtis Fusiliers while his brother commanded the Third Syrtis Fusiliers. For the next four centuries neither regiment would be stationed more than 120 light-years apart.
- Field Report 2765: Federated Suns, p. 19, "Syrtis Fusiliers"