The city centre store will encompass 15,000 square feet, spanning two levels of shopping space, with a main entrance on to Henry Street.
The letting terms were agreed between the retailer and Chartered Lands and Irish Life Assurance owner Joe O'Reilly earlier this month.
A number of smaller units have been merged to accommodate the River Island store.
The rent has not been disclosed.
Chartered Land Chief Executive, Dominic Deeny, said: "The centre, which attracts a weekly footfall of 300,000, has recently undergone extensive refurbishment works and we are confident that the addition of River Island will contribute further towards enhancing the existing strong tenant mix and retail offer at the centre."
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River Island Property Director Frances Baker said trading would commence early next year.
Michael Harrington, Director at HWBC, which advised the landlords, said: "Good news in the retail sector has lately been thin on the ground, but this ILAC letting has clearly shown that there is still very healthy demand for prime retail space in Dublin and that the major multiple retailers have enough confidence in the Irish economy to look beyond the horizon of the current uncertain phase in the market.
"This space which took time to assemble, is quite simply the best shop in Ireland and the addition of River Island between H&M and ZARA is a significant boost for ILAC," added Mr Harrington.
River Island was advised by Colliers Jackson-Stops.
(PR)
