Backpacker Catherine Shaw, 23, from Witney, Oxfordshire, had been travelling through a mountainous region of the Central American country.
In a statement The Lucie Blackman Trust, which has been helping Ms Shaw's family, said it is "saddened to announce that a body has been found in the search for Catherine Shaw". Prior to checking into the hotel, she had been staying in a campervan in the San Pedro, Lake Atitlan area of Guatemala with a friend.
Catherine left Britain last September and was travelling for two weeks in Guatemala, having previously been in Mexico and California.
Search parties looking for a missing British woman in Guatemala say it is "unlikely" that she will be found alive.
Jess Elizabeth, a friend of Ms Shaw, wrote on Facebook that she had "no belongings with her, passport, money or mobile phone - they were left at the hostel".
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Pal Paco Patchouli, issued a desperate appeal on social media.
A fundraiser has been set up to help find Catherine, with almost $10,000 raised in three days to fund her safe return.
"So this is unusual behavior which gives us great concern for her safety".
Her mother said: "Hello Catherine, we've been out of touch for five days and we, your family, your friends, we really need to know you're happy and that you're well". The discovery has prompted renewed searches in the area of San Juan La Laguna.
"Your friends, your family are all really anxious about you, please come home sweetheart".
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"If anybody has any information, at all, please contact us, the Lucie Blackman Trust, or the police", added her father.
The Foreign Office confirmed that it is supporting the family.
In a Facebook post she said that Catherine seemed "really sad" before disappearing and that they played music together late on Monday before she went to bed.
She is described as of "slim build, and about 5ft 7in tall". "They could hold the key to bringing Catherine home", he added.
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