Aloysius (/ˌaloʊˈɪʃəs/ AL-oh-ISH-əs) is a given name.
It is a Latinisation of the names Alois, Louis, Lewis, Luis, Luigi, Ludwig, and other cognates (traditionally in Medieval Latin as Ludovicus or Chlodovechus), ultimately from Frankish *Hludawig, from Proto-Germanic *Hludawiga ("famous battle"). In the US, the name is rare, with fewer than 0.001% of babies receiving the name since the 1940s. Most of those were Roman Catholics.
Notable people with the name include: