The Longbottoms are one of the sacred twenty-eight pureblood families listed in the fictional Pure-Blood Directory (from The Noble and Most Ancient House of Black ), though Neville himself never subscribes to blood-status ideology. In fact, his character serves as a strong counterpoint to pureblood supremacy: he is kind, brave, and proves that worth has nothing to do with blood purity.
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Yes, Neville Longbottom is a pureblood wizard. Both of his parents, Frank and Alice Longbottom, came from established wizarding families, and there is no known Muggle or Muggle-born ancestry in his lineage. The Longbottoms are one of the sacred twenty-eight