Lodewicus Theodorus "Louis" Oosthuizen (; akaberekwa muna 1982) mutambi wegorofu wekuSouth Africa uyo akakunda 2010 Open Championship. Akapedza ari wechipiri mumakwikwi makuru mana: 2012 Masters Tournament, 2015
uye 2021 US Open, 2015 Open Championship, uye PGA Championship muna 2017 na2021. Nzvimbo yake yakakwirira pa Official World Golf Ranking ndeyechina, iyo yaakasvika munaJanuary 2013.