Frank Longbottom is a ficitonal Character from the Harry Potter Universe
Frank Longbottom was an auror, husband to Alice Longbottom and father of Neville Longbottom. Due to the Prophecy spoken by Sybill Trelawney about his son and another baby born at the time, Harry Potter, Frank and his wife Alice, also an auror was tortured by Bellatrix Lestrange, using the Cruciatus Curse, to the points that their minds broke. Despite this torture, they never gave away any information.
Frank and Alice were alive, but horrifically brain damaged, and now reside on the fifth floor of Saint Mungo's with others like them, such as Gilderoy Lockhart. Before his injuries, Frank was a member of the Order of the Phoenix.