This article describes the party affiliations of leaders of each member-state represented in the European Council during the year 2010. The list below gives the political party that each head of government, or head of state, belongs to at the national level, as well as the European political alliance to which that national party belongs. The states are listed from most to least populous. More populous states have greater influence in the council, in accordance with the system of Qualified Majority Voting.
| Party | 1 January 2010 | 11 May 2010 | 29 May 2010 | 8 July 2010 | 13 July 2010 | 14 October 2010 | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| # | QMV | # | QMV | # | QMV | # | QMV | # | QMV | # | QMV | |
| European People's Party | 12 | 184 | 12 | 184 | 13 | 196 | 14 | 203 | 14 | 203 | 13 | 190 |
| Party of European Socialists | 7 | 101 | 6 | 72 | 6 | 72 | 5 | 65 | 5 | 65 | 5 | 65 |
| Independent | 3 | 31 | 3 | 31 | 2 | 19 | 2 | 19 | 1 | 7 | 1 | 7 |
| European Liberal Democrat and Reform Party | 4 | 25 | 4 | 25 | 4 | 25 | 4 | 25 | 4 | 25 | 5 | 38 |
| Party of the European Left | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 | 1 | 4 |
| Alliance of European Conservatives and Reformists | 0 | 0 | 1 | 29 | 1 | 29 | 1 | 29 | 2 | 41 | 2 | 41 |
^ Supported by PD-L ^ AKEL holds only observer status with the Party of the European Left.
| Date | Member-state | Leader | National party | European party |
| 11 May | United Kingdom | David Cameron | Con | AECR |
| 29 May | Hungary | Viktor Orbán | Fidesz | EPP |
| 8 July | Slovakia | Iveta Radičová | SDKÚ–DS | EPP |
| 13 July | Czech Republic | Petr Nečas | ODS | AECR |
| 14 October | Netherlands | Mark Rutte | VVD | ELDR |
| Date | Member-state | Leader | National party | European party |
|---|---|---|---|---|
| 22 June | Finland | Mari Kiviniemi | Kesk. | ELDR |
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Political party strength in the European Union
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| Countries |
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| Political Parties in the European Council |
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