The Empress of the Imperial Romulan State is the head of government and head of state of the recently-proclaimed Imperial Romulan State. The Imperial Romulan State's existence was first proclaimed by Donatra, a former commander in the Imperial Fleet of the Romulan Star Empire, in late 2380, who appointed herself the first Empress. (ST novel: Articles of the Federation)

There is no indication as to whether Donatra intended for the Imperial Romulan State to be matriarchal, but presumably the male head of state if Donatra were to lose power would be the Emperor of the Imperial Romulan State.

Heads of Government
Interstellar States	Federation President • Klingon Chancellor • Romulan Praetor • Imperial Romulan State Empress • Cardassian Castellan • Cardassian Chief Executor • Ferengi Grand Nagus • Tzenkethi Autarch • Gorn Imperator • Breen Domo • Orion Chancellor • Tholian Ruling Conclave • Thallonian Prime Minister • Tezwan Prime Minister • Enoch President • Kropasar High Cyning • Caeliar Tanwa-Seynorral • Talarian Commander-in-Chief • Knshaya Pontifex
Federation Member States	United Earth Prime Minister • Vulcan Administrator • Vulcan First Minister • Andorian Chancellor • Alpha Centauri Governor • Bajoran First Minister • Trill President • Cestus Governor • Betazoid Governor • Denevan President • Pacifican Governor • Peliar Zel Governor • Zaldan Leader
Federation Colonies	Tarsus Governor • Alpha V Governor • Mantilles Governor • Caldos Governor
UFP Member State Polities	United States President (United Earth) • Indian Prime Minister (United Earth) • Governor of Prophet's Landing (Republic of Bajor)
Mirror Universe	Terran Emperor • Terran Consul • Klingon Regent