Seamus O'Donnell († 1905 PD) was a Manticoran citizen and an officer of the Royal Manticoran Navy.
In 1905 PD, he held the rank of Captain and was the commanding officer of the heavy cruiser HMS Star Knight. He died when his ship was ambushed and destroyed by two divisions of Havenite battlecruisers in the Poicters System as part of Operation Perseus. (HH3)