Dai language may refer to:

Tai languages

• the Tai languages in general
• Dai Zhuang language, Dàizhuàngyǔ, 岱壮语, spoken primarily in Wenshan Prefecture, Yunnan, China
• Tai Dam language, Dǎinǎyǔ, 傣哪语; Dǎidānyǔ, 傣担语, spoken by the Tai Dam people in Southeast Asia
• Tai Hongjin language, 红金傣语, spoken in Southern China
• Tai Lü language, Dǎilèyǔ, 傣仂语, spoken by the Lu people in Southeast Asia
• Tai Nüa language, Déhóng Dǎiyǔ, 德宏傣语, spoken by the Dai people, especially in Yunnan province, China
• Tai Ya language, Dǎiyǎyǔ, 傣雅语, spoken primarily in southern China and Thailand

Other languages

• Dai language (Austronesian), a minor Austronesian language spoken on Dai Island in South Maluku, Indonesia
• Dai language (Chad), an Adamawa language of southern Chad
• Dai language (Solomon Islands), a Malayo-Polynesian group language spoken on northeast Malaita of the Solomon Islands