What countries is the queen head of?

She is head of state in sixteen states: Antigua & Barbuda, Australia, the Bahamas, Barbados, Belize, Canada, Grenada, Jamaica, New Zealand, Papua New Guinea, Saint Kitts & Nevis, Saint Lucia, Saint Vincent & the Grenadines, The Solomon Islands, Tuvalu, and the United Kingdom.

Technically, the United Kingdom consists of four countries: England, Northern Ireland, Scotland, and Wales.