The high street fashion retailer awarded Landor the business following a three-way pitch against undisclosed agencies.
Ben Lewis, River Island, chief executive said: "Landor demonstrated a thorough understanding of the River Island brand and are both creatively and strategically strong."
With over 250 stores generating £700m in sales and an international presence across 13 countries, River Island is one of Britain's largest privately owned companies.
The retailer is sponsoring this year's Graduate Fashion Week which runs from Sunday to next Thursday. River Island has sponsored the event for six years.
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