Lilly King (born February 10, 1997) is an American swimmer.
At the 2016 Summer Olympics she won the gold medal in the 100 meter breaststroke competition and also won a gold medal in the women's 4 × 100 m medley relay, in which she swam the breaststroke leg.
She is the current world record holder in 100-metre and 50-metre breaststroke (long course).