The woman was injured by a lightning strike on Kasjuni beach on Saturday afternoon.
Local police in Split, on the Adriatic coast, say she received medical treatment and was taken to hospital where she is being kept for further treatment.
The woman, said to be a 48-year-old British national, had been sunbathing with her daughter when a thunderstorm moved in.
A statement added: “Her life is in danger.
The woman was injured by a lightning strike on Kasjuni beach
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The woman is said to have been knocked unconscious by the strike
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“An investigation will be conducted at the scene and all the circumstances of this accident are being determined.”
She was struck and knocked unconscious as they tried to reach a nearby hotel, before her daughter’s screams alerted a medic who was dealing with a bike accident in a triathlon taking place nearby, it is reported.
An official from the Marjenski Dir triathlon told MailOnline: “The woman was struck close to the beach and fortunately for her one of our on-call medics who was attending the event managed to revive her.
“He was close by dealing with a bike accident that had just taken place and when he heard the screams he rushed over to help the woman and he stabilised her until the ambulance arrived.”
A Foreign Office spokesperson said: “We are providing support to the family of a British national in Croatia and are in contact with the local authorities.”
