The Cabinet Office said the right to vote in UK elections for Commonwealth citizens who live in the country "reflects our close historical ties with Commonwealth countries."
A Cabinet Office spokesman said: "Excluding Commonwealth citizens would be a significant step and would require careful consideration.
"Parliament has previously taken the view that these rights should not be changed."
More top news
Ireland's new laws on gay marriage will be enacted by the end of July, with the first ceremonies likely in the autumn.
Stars such as Simon Cowell and Stephen Fry called on their Twitter followers to retweet missing person appeals for 24 hours.
Norwich have been promoted to the Premier League after a 2-0 victory against Middlesbrough at Wembley Stadium.