Luis Siret y Cels (Sint-Niklaas, 26 August 1860 – Herrerías, 7 June 1934) was a Belgian-Spanish archaeologist and illustrator.
He was born in Belgium, but when he was 21 he went to Cuevas del Almanzora (Almería) when he was contracted by the mining company Almagrera as a Mining Engineer.
Though 50 years, Luis Siret and his brother Henri Siret investigated Neolithic, chalcolitic and Bronze Age sites in Almizaraque, Palacés, El Argar, El Gárcel or Los Millares. His discoveries meant a great advance in the history of South-easterner Iberian Peninsula and helped settle the sequence from Palaeolithic to Copper Age in the zone. His works were exhibited in 1900 Exposition universelle de Paris and 1929 Exposición Universal de Barcelona, and they are currently exhibited in the Museo Arqueológico Provincial de Almería, in the Museo arqueológico Nacional de Madrid, in the Museé du Cinquentenaire in Brussels and several important collections all over the world including in The British Museum in London.