The attackers fired on beach-goers in Grand Bassam, about 40km (25 miles) from the commercial capital Abidjan.
The resort is popular with both locals and foreigners. Four of the dead were Westerners, including a French and a German national, officials say.
Al-Qaeda in the Islamic Maghreb (AQIM) has claimed the attack. The gunmen have been “neutralised”, officials say.
Ivory Coast was once one of the most stable countries in West Africa.
However, a civil war broke out in 2002, pitting the mainly Muslim north against the largely Christian south. Since then, peace deals have alternated with renewed violence.
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Image courtesy of Reuters