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Queen Maxima and King Willem-Alexander were among the crowd at the Fisht Olympic Stadium, as were Prince Albert and Princess Charlene of Monaco, Prince Guillaume and his father Grand Duke Henri of Luxembourg.
Flying the flag for Great Britain was Princess Anne. The new grandmother took time to meet with Britain's athletes and Russian President Vladimir Putin, before the ceremony began.
As the opening ceremony's celebrations began the royal were seen excitedly waiting for their respective country's teams.
Grand Duke Henri, 58, and his 32-year-old son Prince Guillaume held their red and blue flag aloft and cheered when Luxembourg's team paraded around the stadium.
Honouring the Dutch national colour, King Willem-Alexander, 46, and Queen Maxima, 42, opted to wave orange scarves in support of The Netherlands' athletes.
Wearing a scarf emblazoned with the Principality of Monaco's emblem former Olympic swimmer Princess Charlene waved enthusiastically alongside her husband Prince Albert, whose blazer bore the same motif.