Louise Uma Landgraf (born 27 January 2009) is a Thai-French amateur golfer.

In 2023, she won the Terre Blanche Ladies Open, an LET Access Series event, at the record young age of 14 years, 2 months and 18 days.

[4] In 2023, Landgraf became the youngest winner on the LET Access Series by winning the Terre Blanche Ladies Open aged 14 years, 2 months and 18 days.

She beat the previous record held by fellow Thai Atthaya Thitikul who won the 2017 Ladies European Thailand Championship at age 14 years, 4 months and 19 days.

[6] In 2024, Landgraf was runner-up at the 2024 Internationaux de France U21 – Trophée Esmond, and won the British Girls U16 Amateur Golf Championship at The Berkshire and the Annika Invitational Europe in Sweden, two of which are qualifying events for the 2024 Junior Solheim Cup.