Harry Nielsen (born 3 May 1995) is an Australian cricketer, the son of former South Australian cricketer Tim Nielsen. During the 2017–18 season, he made his debut in all three major forms of the game, first-class, one-day and Twenty20 cricket playing for Cricket Australia XI in the JLT One-Day Cup and tour matches, the Adelaide Strikers in the Big Bash League and South Australia in the Sheffield Shield.