An Comisiún Toghcáin has urged people to register to vote in the General Election.
Chief Executive Art O'Leary said that Sunday is the deadline to apply for a postal vote and an application for an ordinary vote must be made by Tuesday.
"The timelines are very short here, because of the short election campaign," he told RTÉ's News at One.
"People are probably aware that diplomats, gardaí and members of the Defence Forces are entitled to a (postal) vote, but people with a disability who are unable to attend a polling station on the day of the vote are entitled to a postal vote.
"Also, students who are away from home who are studying somewhere else in the State and those who, because of their work, won't be able to attend a polling station - people like airline pilots, long-distance lorry drivers - they're all entitled to a postal vote," he added.
Prisoners and members of An Garda Síochána are also entitled to a postal vote.
Mr O'Leary said that a form to apply for a postal vote is available on checktheregister.ie.
Certification is involved, potentially requiring a doctor, university or employer's confirmation.
"The closing date is Sunday, so they really need to do it today," he advised.
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Mr O'Leary encouraged everyone to check the register to confirm that they are registered.
"Even if you voted this year already in the referendums and the local and European Parliament elections, please just check that you are on the register.
"For those who are new voters, it takes two minutes and 57 seconds to register yourself for a vote," he added.
To be included in the Register of Electors, people must be at least 18 years old and be ordinarily resident at an address in Ireland.
If they have more than one address, they should give the one where they want to be registered as people can only be registered at one address.
Those who are homeless or have no address, can still register to vote by stating that they have 'no fixed address'.
If someone does not give a PPS number, they must get a registration form and their identification witnessed at a garda station or local authority office.
