Camadevi (also spelled Jamadevi; IPA: [tʃaːmaˈdeːʋiː]; Pali: Cāmadevī; Thai: จามเทวี, RTGS: Chammathewi, Mon: စာမ္မာဒေဝဳ, IPA: [t͡ɕaːm.má.tʰeː.wiː]; 7th-century – 8th-century) was the first monarch and Queen of Hariphunchai (Pali: Haribhuñjaya), which was an ancient Kingdom in the Northern part of nowadays Thailand before its united with the Kingdom of Sukhothai, the first Thai Kingdom.

Most records of Camadevi mention her life period differently. For example: A book called “Chinnakanmalipakon” said that she reigned in 662 for 7 years; Manit Wallipodom's research mentioned that she was born in 623, reigned in 662 for 17 years and died in 715 at the age of 92; and The legend of Camadevi translated and edited by Suttavari Suwannapat mentioned that she was born in 633, reigned in 659 up til 688 and died in 731.

As written in the Legend of Cāmadevivaṃsa, it was recorded that she was a scion of the ruler of Lavo Kingdom. But according to the mythology, people believe she was a daughter of a wealthy man named Inta, who lived in the Nong Duu village, which is in Pasang district of Lamphun at the present time. When she turned 3 months old, she was grabbed and taken away by a giant bird. The bird flew over Doi Suthep and gave the young baby to a hermit named Suthewa Rusi. He took good care of her and named her Vi.

Vi grew up well-educated with Suthewa Rusi. As Vi turned 13 years old, he prophesied her destiny and found out that she had a chance to be the ruler of a great kingdom in the future. He built a raft and sent her away to Lavo because it was the most prosperous kingdom at that time. It took months for the raft to reach the Lavo Kingdom. As the raft reached the kingdom, people were very amazed by the incident. The King and the queen were very pleased about the girl's arrival. They kept her and gave her a new name, which was Camadevi.

Camadevi grew up and lived comfortably in the royal court of the Lavo Kingdom. After the ruler and his wife were informed by the fortune-teller that this girl had glory to become the powerful ruler of a great kingdom and would also marry a great man, they raised Camadevi position to be the Princess of Lavo and arranged a coronation for her when she was 14 years old.

A marriage was arranged for Camadevi, as she turned 20. She was supposed to marry Ramrat, a prince from the neighboring Kingdom, Ramburi. As she was well known for her beauty, Khun Luang Wilangka, the ruler of the Lawa people, asked the King of Lavo for permission to marry her but was rejected. He felt enraged and decided to start a war with Lavo Kingdom to win Camadevi.

Camadevi chose to lead the army herself. She gained allies from neighboring kingdoms and could win the army. Her victory was admired and celebrated by the people but Camadevi was sorrowful about all the lives lost in this war, so she gave an order to build a temple on the battleground devoted to the deceased.

According to the Legend of Cāmadevivaṃsa, the war took place in 653. After the situation was settled, the marriage was arranged 2 years later.