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No, Neville Longbottom is not single.
It is unknown if Neville Longbottom had any children.
Neville Longbottom became the Herbology teacher at Hogwarts.
She went with Neville Longbottom
Neville Longbottom is a/an Professor of Herbology at Hogwarts School of Witchcraft and Wizardry