Phannarai (Thai: พรรณราย; 9 May 1838 – 22 June 1914), formerly Princess Chae Siriwong (แฉ่ ศิริวงศ์), was one of the consorts of Mongkut of Siam, fourth King of the Chakri dynasty.

When her sister died in 1861, she assumed the position as the senior consort of Mongkut.

The character of Lady Thiang in The King and I is loosely based on her.

Anna Leonowens came to the royal court in 1862 and left in 1867, a period of six years in which she was in charge of Lady Phannarai's children and the other children of King Mongkut.

[1] With Mongkut, Princess Phannarai bore: As she was the aunt of Chulalongkorn (Rama V) (Queen Debsirindra's son), Mom Chao Chae was elevated to Phra Ong Chao Phannarai in 1900.