Lupine is commonly utilized as a technological food and ingredient in a great variety of processed products (snacks, bakery, meat, and dairy products) principally owing to its nutritional value and technological properties. However, its ingestion, even at trace amounts (in the range of mg protein per kg of food), can lead to severe adverse reactions in allergic individuals. Lupine belongs to the Leguminosae family, having the conglutins (α-, ÎČ-, ÎŽ-, and Îł-) as allergens, among other proteins. Cross-sensitization of lupine-sensitized individuals with other legume species, mainly peanut, can occur, but the associated clinical reactivity is still unclear. The protection of the sensitized individuals should depend on an avoidance diet, which should rely on the compliance of food labeling and, as such, on their verification by analytical methods. Food processing, such as heat treatments, has an important influence on the structural properties of lupine proteins, altering their detectability and allergenicity. In this review, different aspects related with lupine allergy are described, namely, the overall prevalence, clinical relevance, diagnosis, and treatment. The characterization of lupine allergens and their potential cross-reactivity with other legumes are critically discussed. The effects of food matrix, processing, and digestibility on lupine proteins, as well as the available analytical tools for detecting lupine at trace levels in foods, are also herein emphasized. K E Y W O R D S allergen, analytical methods, food allergy, Lupinus species, protein 1 INTRODUCTION Lupine belongs to the Lupinus genus from the Fabaceae or Leguminosae family, which also comprises soybean, peanut, chickpea, and other types of legumes (Villarino, Jayasena, Coorey, Chakrabarti-Bell, & Johnson, 2016). From approximately 450 known species of lupine, four are of agricultural and commercial interest: Lupinus albus (white lupine), native from the Mediterranean region and Africa; Lupinus angustifolius (blue lupine) from Australia; Lupinus luteus (yellow lupine) from Central Europe; and Lupinus mutabilis from South America (Jappe & Vieths, 2010; Sanz, de Las Marinas, Fernandez, & Gamboa, 2010). According to FAOSTAT, a total world production of 1,188,213 tonnes of lupine was reached in 2018. Australia is the main producer, with 714,254 tonnes in 2018, accounting to 60.1% of total world lupine production. In Europe, Russia and Poland are the main producers, reaching 136,352 and 124,314 tonnes in 2018, respectively, corresponding to 39.9% and 36.4% of total lupine production in Europe, respectively (FAOSTAT [http://www.fao.org/ faostat/en/#home]).