Membership of the NATO Parliamentary Assembly is congruent with membership of NATO. Thus, the parliaments of the 28 NATO member nations are all full members of the Assembly.

Albania (Assembly of the Republic) - 4
Belgium (La Chambre/ Senate, Federal Parliament) - 7
Bulgaria (National Assembly) - 6
Canada (Senate and House of Commons) - 12
Croatia (House of Representatives) - 5
Czech Republic (Poslanecka Snemovna/ Senat/ Delegation) - 7
Denmark (Folketinget) - 5
Estonia (Riigikogu) - 3
France (Assemblee Nationale/ Senate) - 18
Germany (Bundestag/ Bundesrat) - 18
Greece (Parliament) - 7
Hungary (Orszaggyules) - 7
Iceland (Althingi) - 3
Italy (Camera/ Senato) - 18
Latvia (Saeima) - 3
Lithuania (Seimas) - 4
Luxembourg (Chambre des Députés) - 3
Netherlands (Eerste Kamer/ Tweede Kamer) - 7
Norway (Stortinget) - 5
Poland (Sejm/ Senat) - 12
Portugal (Parlamento) - 7
Romania (Camera Deputatilor/ Senat) - 10
Slovenia (Drzavni Zbor) - 3
Slovakia (Národna rada Slovenskej republiky) - 5
Spain (Congreso/ Senado) - 12
Turkey (Turkish Grand National Assembly) - 12
United Kingdom (House of Commons/ House of Lords) - 18
United States (House of Representatives/ Senate) - 36
Total: 257


14 countries have been granted associate member status:
Armenia (Parliament) - 3
Austria (Parliament) - 5
Azerbaijan (Milli Mejlis) - 5
Bosnia and Herzegovina (Skupstina) - 3
Finland (Parliament) - 4
FYROM * (Sobranie) - 3
Georgia (Parliament) - 4
Moldova (Parlamentul Republicii Moldova) - 3
Monténégro (Parliament) - 3
Russian Federation (State Duma/ Council of the Federation) - 10
Serbia (National Assembly) - 5
Sweden (Riksdagen) - 5
Switzerland (Federal Assembly) - 5
Ukraine (Parliament) - 8
Total: 66

European Parliament Delegation
Total: 10


Regional Partner and Mediterranean Associate Member Delegations
Algeria (National Peoples's Assembly/ Council of the Nation) - 3
Morocco (Majlis Nawab/ Majlis al-Mustacharin) - 3
Israel (Parliament) - 3
Jordan (Parliament/ House of Representatives/ Senate) - 3
Total: 12


Parliamentary Observer Delegations
Australia (Parliament) - 2
Egypt (People's Assembly/ Shoura Assembly)- 2
Japan (House of Representatives/ House of Councillors)  - 2
Kazakhstan (Parliament) - 2
Palestinian Legislative council (Palestinian Legislative council) - 2
Tunisia (Chamber of Deputies/ Chamber of Councilors) - 2
South Korea (National Assembly) - 2
Total: 14


Inter-parliamentary Assembly Delegations
OSCE PA (Organization for Security and Co-operation in Europe Parliamentary Assembly)- 2
PACE (Parliamentary Assembly of the Council of Europe) - 2
ESDA-AWEU (The European Security and Defence Assembly (WEU Assembly)) - 2
Total: 6