An amphoe (sometimes also amphur, Thai: อำเภอ, [ʔāmpʰɤ̄ː]) is the second level administrative subdivision of Thailand. Usually translated as district, amphoe make up the provinces, and are analogous to a county. Amphoe are further subdivided into tambon.

Altogether Thailand has 878 districts, not including the 50 districts of Bangkok which are called khet (เขต) since the Bangkok administration reform in 1972. The number of amphoe in a province differs, from only 3 in the smallest provinces up to the 50 urban districts of Bangkok. Also the sizes and population of the amphoe differs greatly, the lowest population being in Ko Kut (Trat Province) with just 2,042 citizens, while Mueang Samut Prakan (Samut Prakan Province) has 509,262 citizens. The khet of Bangkok have the smallest areas – Khet Samphanthawong is the smallest with only 1.4 km² – while the amphoe of the sparsely populated mountain regions are bigger than some provinces – Umphang (Tak Province) with 4,325.4 km² is the largest and also has the lowest population density.

Princess Galyani Vadhana, the Princess of Naradhiwas (Thai: กัลยาณิวัฒนา, RTGS: Kanlayaniwatthana; 6 May 1923 – 2 January 2008) was a princess of Thailand and the elder sister of King Ananda Mahidol (Rama VIII) and King Bhumibol Adulyadej (Rama IX). She was also a direct granddaughter of King Chulalongkorn (Rama V).

Princess Galyani Vadhana was born on 6 May 1923 in London, England, the only daughter of Prince Mahidol Adulyadej of Songkla, the sixty-ninth son of King Chulalongkorn (Rama V) and seventh son by Queen Savang Vadhana, and Miss Sangwal Talabhat (later known as Princess Srinagarindra, The Princess Mother). She was initially named "May" on her birth certificate and was later named Mom Chao Galyani Vadhana Mahidol by King Vajiravudh (Rama VI). The word "Vadhana" in her name came from her paternal grandmother, Savang Vadhana. In 1927, she was subsequently promoted to the royal rank, a Princess of Thailand (Phra Vorawongse Ther Phra Ong Chao) by King Prajadhipok (Rama VII).

In 1935, Princess Galyani Vadhana attended a secondary school for girls named Ecole Superieure des Jeunes Filles de la Ville de Lausanne.