Loiu (Spanish: Lujua) is a town and municipality located in the province of Biscay, in the autonomous community of Basque Country, northern Spain.

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Loiu
Municipality
Flag Coat of arms
Loiu Location of Loiu within the Basque Country
Coordinates: 43°18′53″N 2°56′20″W
Country	Spain
Autonomous community	Basque Country
Province	Biscay
Comarca	Greater Bilbao
Area
• Total	15 km2 (6 sq mi)
Elevation	26 m (85 ft)
Population  (2018)[1]
• Total	2,416
• Density	160/km2 (420/sq mi)
Demonym	Basque: loiutarra
Time zone	UTC+1 (CET)
• Summer (DST)	UTC+2 (CEST)
Postal code	48180
Website	Official website

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The Bilbao Airport terminal lies within the municipality limits.

Loiu is located in the Asua Valley, with Derio lying to the East and Erandio to the West.

A big part of the population is dispersed around country farmhouses (called baserri or caseríos). The main neighbourhood is Zabaloetxe, where the church is located. Other urban areas are Elochelerri (in Basque Elotxelerri), on the way to Asua Valley (BI-637), next to the airport, and Lauros (Lauro).

Since the most recent expansion of Bilbao Airport, many of its facilities including the passenger terminal are located within the municipality.

In Euskera, the town is officially called Loiu. In Spanish, the town is called Lujua.

The old name of the town was Luxua, but it was converted into Spanish after the phonetic evolution of x/j (around 17th century) in Lujua (paralleling the change Xerez -> Jerez).^{[citation needed]}

In Euskera, the phonetic evolution of the toponym was different: when the -a ending was lost, phoneme x evolved in a different way to the Spanish language y, and the variation of the tonic syllable lu for lo. That is Luxu(a) -> Lu(x)u -> L(u)iu -> Loiu. Euskaltzaindia adopted Loiu as the official form of the name.^{[citation needed]}. Loiu adopted its official name in 1983.^{[citation needed]}

• Caserío Bengoetxe