International Journal of Neutrosophic Science IJNS 2690-6805 2692-6148 10.54216/IJNS https://www.americaspg.com/journals/show/4071 2020 2020 Division of Computational Science, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand Ronnason Ronnason Division of Computational Science, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand Anusorn Simuen Division of Computational Science, Faculty of Science, Prince of Songkla University, Songkhla 90110, Thailand Ronnason Chinram An interval-valued neutrosophic set is a type of neutrosophic sets where the membership, indeterminacy, and non-membership degrees are represented by closed intervals within the unit interval [0, 1]. An interval-valued picture fuzzy set is one of special cases of interval-valued neutrosophic sets. In this paper, we apply interval- valued picture fuzzy sets on almost ideals of semigroups. Moreover, we study a relationship between each almost ideal in a semigroup and their interval-valued picture fuzzifications. 2026 2026 303 319 10.54216/IJNS.270226 https://www.americaspg.com/articleinfo/21/show/4071