Navarrese Left Union (Spanish: Unión Navarra de Izquierdas), better known by its acronym UNAI was an electoral coalition formed in 1977 to present a list in the first democratic elections in Spain since 1936 in the constituency of Navarre.
UNAI was formed by several Basque nationalist and communist parties that had been part of the platform Euskal Erakunde Herritarra.
In the general election of July 1977 the head of the list was Javier Erice, who had been mayor of Pamplona for a few months in 1976, until he was dismissed by the civil governor.
UNAI sent Jesus Urra to the commission that prepared the 1977 pre-autonomic agreement; this caused several activists of Euskadiko Ezkerra, that were against supporting any autonomic agreement that didn't include the KAS Alternative, to leave the coalition and join the newly formed Herri Batasuna (HB).
Meanwhile, EIA, this time as Euskadiko Ezkerra also in Navarre, was integrated in different coalitions: Basque Nationalists (with the PNV, Euskal Sozialistak Elkartzeko Indarra and the Party of Labour of Spain) in the merindad of Pamplona and inside Electoral Groups of Merindades (AMAIUR, along with HB and EMK) at Estella, Sangüesa and Olite.