Rai may refer to:

• Rai, Orne, a commune of the Orne département, in France
• Rai (area), a traditional Thai unit of area, equalling 1,600 m²
• Rai stones, a kind of stone money used in Yap (Caroline Islands)
• Rai (ethnic group), an ethnolinguistic group of Nepal
• Rai language - see Dhanwar language
• Rai (Indian), a title in India, with various related meanings and compound forms
• Rai University, a university in India.
• Aishwarya Rai, an Indian Bollywood actress
• Kayyara Kinyanna Rai, a Kannada writer and activist in India
• Rai (comics), a fictional character from Valiant Comics.
• Rai (book), a book by Kensaku Shimaki
• Rai (Punjabi surname), a surname found in Punjab.
• Rai Bakuoh, one of the characters from the fighting game Waku Waku 7
• Rai, the word for paradise in Slavic languages
• Rai, a transcription of the word for thunder in Japanese.
• Rai, a surname of Tulu speaking Shetty or Bunt community of Mangalore.

The acronym RAI refers to:

• RAI, Radioactive Iodine treatment, used to treat thyroid problems
• RAI, Radiotelevisione Italiana, Italian public broadasting
• RAI, Riches Apples, Inc. , a US based technology consulting firm

Similar terms:

• Raï, a form of folk music, originated in Oran, Algeria, from Bedouin shepherds
• Raí, Brazilian football (soccer) player
• Ray, Iran
• Raidiese F. Branstein, a fictional character from Super Robot Taisen