Amita Marie Nicolette Berthier (born 15 December 2000) is a Singaporean fencer based in US. She attends the University of Notre Dame. On 16 December 2017, Berthier, a left-handed foil fencer, became the first Singaporean fencer to win a Junior World Cup title at the Havana leg in Cuba in the eight-leg series.
In April 2021, she qualified for the Singapore Olympic team at the 2020 Summer Olympics, becoming the first Singaporean to win a spot through qualifying tournament.
In 2023, Berthier was chosen alongside wushu athlete Jowen Lim as the flagbearers for the 2022 Asian Games held in Hangzhou, China.