How Many Queens In The World?

Monarchies around the world

Africa

Lesotho - King Letsie III

Morocco - King Mohammed VI

Swaziland - King Mswati III

Asia

Bhutan - King Jigme Khesar Namgyal Wangchuck

Brunei - Sultan Haji Hassanal Bolkiiah

Cambodia - King Norodom Sihamoni

Japan - Emperor Akihito

Malaysia - King Mizan Zainal Abidin

Thailand - King Bhumibol Adulyadej

Europe

Andorra - Princes Nicolas Sarkozy and Joan Enric Vives Sicilia

Belgium - King Albert II

Denmark - Queen Margarethe II

Liechtenstein - Prince Hans Adam II

Luxembourg - Grand Duke Henri

Monaco - Prince Albert II

Neterlands - Queen Beatrix

Norway - King Harald V

Spain - King Juan Carlos I

Sweden - King Carl Gustaf XVI

United Kingdom of Great Britain and Northern Ireland - Queen Elizabeth II

Middle East

Bahrein - King Hamad bin Isa al-Khalifa

Jordan - King Abdullah II

Kuwait - Emir Sabah Al-Ahmed Al Jaber Al-Sabah

Oman - Sultan Oabus ibn Sa'id

Qatar - Emir Sheik Hamad ibn Khalifa al-Thani

Saudi Arabia - King Abdullah bin Abdulaziz al-Saud

United Arab Emirates - Sheik Khalifa bin Zayed Al Nahyan

Other

Tonga - King George Tupou V.

That's 31 unless I've mis-counted.