Joan I (14 January 1273 – 31 March/2 April 1305)[1] (Basque: Joana, Spanish: Juana) was ruling Queen of Navarre and Countess of Champagne from 1274 until 1305.

Joan was born in Bar-sur-Seine, Champagne on 14 January 1273 the daughter of King Henry I of Navarre and Blanche of Artois.

Various powers, both foreign and Navarrese, sought to take advantage of the minority of the heiress and the "weakness" of the female regent, which caused Joan and her mother to seek protection at the court of Philip III of France.

[11] Joan never visited the Kingdom of Navarre, which was ruled in her name by French governors appointed first by her father-in-law and then by her spouse in her name.

Philip IV appointed her administrators, however, Joan visited Champagne regularly and is recorded to have participated in all duties of a ruling vassal and is not regarded to have been passive but an active independent ruler in this domain.

[13] She also acted in her process against Bishop Guichard of Troyes, whom she accused of having stolen funds from Champagne and her mother by fraud.

[13] Joan died in 1305, allegedly in childbirth, but the bishop of Troyes, Guichard, was arrested in 1308 and accused of killing her with witchcraft.