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Verdict
Yes — you can hold Ireland and United Kingdom citizenship simultaneously.
Ireland
Dual citizenship policy
Permitted — Ireland allows dual citizenship and recognizes all diaspora returns.
United Kingdom
Dual citizenship policy
Permitted — the UK allows dual citizenship.
Both Ireland and United Kingdom permit dual citizenship. You can acquire, hold, and use both passports simultaneously without legal restrictions.
This assessment is based on each country's current nationality law. Dual citizenship rules can change — always verify with the relevant consulate or an immigration attorney before making decisions about renunciation or acquisition.