Princess Suvadhana (Thai: สุวัทนา; RTGS: Suwatthana, 15 April 1905 – 10 October 1985) was the royal consort of King Vajiravudh (or Rama VI) of Siam.

She was born a commoner; her father was Lord Abhayabhupesa (Lueam Abhayavongsa) and her mother was Ms. Lek Bunnag.

Although King Vajiravudh initiated many Siamese nationalistic policies of the 1920s, his queen Suvadhana was a daughter of the Thai governor of Phratabong province (Battambang).

Suvadhana's grand aunt, Khun Chom Iem Busba, was the wife of King Norodom I of Cambodia.

Suvadhana died at Siriraj Hospital on the 10 October 1985 at the age of 80, her funeral was presided over by King Bhumibol Adulyadej (or Rama IX) and Queen Sirikit.