Rajini School is a private girls' school in Thailand, and one of the oldest in the country. It was founded in 1904 by Queen Saovabha Phongsri as a replacement for the recently closed Sunanthalai School, which she had previously also sponsored. The school is situated in Bangkok's Phra Nakhon District, at the southern tip of the historic inner Rattanakosin Island. Today it admits kindergarten to upper secondary students, with an enrolment of 2,861 in 2019, and is known for its traditional values. The historic Sunanthalai Building is a listed ancient monument.

Joachim Grassi was an Austrian architect of Italian descent who worked for the Siamese government in the late nineteenth century. He was among the first European architects employed by King Chulalongkorn, and contributed extensively to Siam 's architecture, especially the Neo-Classic, during the time of its modernization.