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| 1950, Jan. 26 |
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| Ireland concluded a treaty of friendship, commerce, and navigation with the United States. | 1 |
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| 1951, May 4 |
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| The cabinet headed by Prime Minister Costello resigned. An election (May 30) gave a majority to the Fianna Fáil Party, and a new cabinet with Eamon de Valera as prime minister came to office on June 13. | 2 |
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| 1954, May 18 |
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| After de Valera's defeat in national elections, Costello formed a coalition government. | 3 |
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| 1955, Dec. 14 |
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| Ireland admitted to the United Nations. | 4 |
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| 1959, June 17 |
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| Eamon de Valera was elected president of Ireland, resigning the post of prime minister he had earlier regained. | 5 |
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| June 23 |
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| Deputy Prime Minister Sean Lemass was elected prime minister by the dáil (Parliament). | 6 |
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