Austin Ernst (born January 31, 1992) is an American professional golfer on the LPGA Tour.
In August 2020, Ernst won the Walmart NW Arkansas Championship, for her second LPGA Tour title. In the final round, she shot 8-under 63 for a two-stroke victory over Anna Nordqvist.
Ernst announced her "semi-retirement" from tournament play in June 2023 due to a lingering neck injury. Her last LPGA Tour event was the 2023 Women's PGA Championship, where she had to withdraw after the first round. She also accepted an assistant coaching position at Texas A&M University.
| 1 | Aug 31, 2014 | Portland Classic | 69-69-69-67=274 | −14 | Playoff | In-Kyung Kim |
| 2 | Aug 30, 2020 | Walmart NW Arkansas Championship | 65-65-63=193 | −20 | 2 strokes | Anna Nordqvist |
| 3 | Mar 7, 2021 | LPGA Drive On Championship | 67-67-69-70=273 | −15 | 5 strokes | Jennifer Kupcho |
| 1 | 2014 | Portland Classic | In-Kyung Kim | Won with par on first extra hole |
| Chevron Championship | T49 | CUT | T51 | T20 | T32 | T14 | T25 | T71 | T40 | T40 | T53 | |
| Women's PGA Championship | CUT | 71 | CUT | T64 | T29 | CUT | CUT | T58 | T7 | WD | ||
| U.S. Women's Open | T48 | T47 | CUT | T44 | T41 | T50 | CUT | T57 | ||||
| The Evian Championship | CUT | CUT | T70 | T67 | T48 | T2 | T25 | NT | T35 | |||
| Women's British Open | CUT | T62 | T56 | CUT | CUT | CUT | T61 | 5 | CUT |
LA = Low amateur
CUT = missed the half-way cut
WD = withdrew
NT = no tournament
T = tied
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Professional
| Career | 8 | 3–4–1 | 0–1–1 | 2–2–0 | 1–1–0 | 3.5 | 43.8 |
| 2017 | 4 | 2–2–0 | 0–1–0 lost to M. Sagström 3&2 | 1–1–0 lost w/ Paula Creamer 3&1 won w/ P. Creamer 5&3 | 1–0–0 won w/ P. Creamer 2&1 | 2.0 | 50.0 |
| 2021 | 4 | 1–2–1 | 0–0–1 halved w/ Nanna Koertz Madsen | 1–1–0 lost w/ Danielle Kang 1 down won w/ D. Kang 1 up | 0–1–0 lost w/ D. Kang 3&2 | 1.5 | 37.5 |
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