Work by Turquoise will involve on- and off-screen executions and will be unveiled early next year.
Catherine Mackin, TV3 deputy director of programming, said: "We are delighted to be working with Turquoise on this significant step in TV3's continued development."
TV3 launched in 1998 and is Ireland's first independent, advertiser-supported, free-to-air TV channel.
TV3 broadcasts a mix of information and entertainment shows, the bulk of which are UK and US imports including ITV's 'Coronation Street' and 'Bad Girls'.
Turquoise managing director Sharon Wheeler said: "TV3 has become a very important part of life in Ireland.
"The channel offers a real mix of programming and we intend to create an identity package which builds on the excitement and full entertainment experience that TV3 viewers have come to expect and love."
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