AbstractIn this paper, we introduce and study the concept of regular semi continuous, regular semi irresolute, regular semi-T1/2 space, regular semi homeomorphisms and regular semi c-homeomorphisms in neutrosophic topological spaces. Moreover, we investigate the relationship among neutrosophic regular semi continuous, neutrosophic regular semi irresolute, neutrosophic regular semi homeomorphism and neutrosophic regular semi Chomeomorphisms mappings. Finally, we have given some counter examples to show that these types of mappings are not equivalent.