Princess Charoensri Chanamayu or Phra Chao Boromwongse Ther Phra Ong Chao Charoensri Chanamayu (RTGS: Charoensi Chonmayu) (Thai: พระเจ้าบรมวงศ์เธอ พระองค์เจ้าเจริญศรีชนมายุ) (31 March 1878 – 24 December 1916), was a Princess of Siam (later Thailand).

She was a member of the Siamese Royal Family.

She was the daughter of Chulalongkorn, King Rama V of Siam.

Her mother was The Noble Consort (Chao Chom Manda) Saeng Galyanamitra (daughter of Phraya Jayavichit, granddaughter of Chao Phraya Nikara Bodindra (Toh) who built Galyanamitra Temple).

Princess Charoensri Chanamayu had 3 full siblings; 2 elder brothers and 1 elder sister; Princess Charoensri Chanamayu died 24 December 1916, aged 38.