By augmenting the Quadratic Almost Ideal Demand System model, a demand system analysis was conducted for peanuts and tree nuts in the United States. Monthly observations from 2004 through 2015 derived from the Nielsen Homescan Panel were used. The estimated uncompensated own-price elasticities for peanuts and the granular array of tree nuts considered ranged from -0.31 (pistachios) to -2.08 (almonds). Estimated income elasticities varied from 0.50 (walnuts) to 0.85 (pistachios), indicative of necessities. Substitutability and complementarity among the set of nut products were evident. The study contributes to the literature by providing a more up-to-date and thorough analysis of the demand for peanuts and tree nuts presently lacking in the extant literature.