H.R.H. Princess Sirivannavari Nariratana Rajakanya (born 8 January 1987) is a Princess of the Kingdom of Thailand. She has produced works as a fashion designer, and competed in sports as an equestrian and former badminton player. The princess is considered as one of the royal family members who are active in social work. She graduated with a Bachelor of Arts degree from Chulalongkorn University and a master in design from École de la chambre syndicale de la couture parisienne. She was elevated to Princess status by royal command of her grandfather, King Bhumibol Adulyadej, on 15 June 2005.

Princess Sirivannavari represented Thailand in badminton in 2005 at 23rd South East Asian Games in the Philippines, winning a team gold. In this, she follows in the footsteps of her grandfather, King Bhumibol Adulyadej, who represented his country in international sailing events. A badminton tournament that made its debut in 2016, the Thailand Masters, was named as the Princess Sirivannavari Thailand Masters.

In 2007, she was invited by Pierre Balmain, the French couturier, to present her fashion show in Paris. Her debut Paris collection was titled Presence of the Past, which drew on memories of her royal grandmother as well as giving a modern interpretation to traditional Thai costume. The following year, she presented her own fashion show in Paris. She designed a dress worn by the Thai entrant in the Miss Universe Thailand 2018 pageant. YouTube personality Wanchaleom Jamneanphol was subsequently threatened with prosecution under Thailand's lèse-majesté laws, after describing the dress as ugly.

Sirivannavari began riding horses at age nine. She trained in France at the International Moniteur d' Equitation, Le Cadre Noir de Saumur. She competed as a member of the Thai equestrian sports team in the 2013 and 2017 Southeast Asian Games.

In 2008, she was included as 16th on the list of the "20 Hottest Young Royals", compiled by Forbes.
Maison Sirivannavari Bangkok is highly well known in Thailand and the fashion industry as the princess’s signature design, which represents her unique graphic prints and avant garde silhouettes.

Sirivannavari Bangkok continues to develop new areas of expression such as ready-to-wear, footwear, activewear, leather goods, accessories and jewellery line. These products are created with the utmost care and attest to Sirivannavari’s commitment to the finest quality craftsmanship.

Sirivannavari. (December 24, 2020). 
Sirivannavari Bangkok. (2018).