HMS Janissary was a destroyer of the Royal Manticoran Navy.

In early 1921 PD, the ship, commanded by Lieutenant Commander Maitland Naysmith, was part of the improvised squadron Captain Aivars Terekhov put together to investigate the covert military build-up in the Monica System. It was destroyed in the Battle of Monica, and its name was put on the List of Honor. (SI1)