Wa or wa can mean:

• Wa (nationality) (佤), an ethnic group in China
• Wa (Japanese) (和), an important linguistic concept in Japanese.
• Wa, Ghana, a city in West Africa.
• Walloon language (ISO 639 alpha-2, wa)
• abbreviation for Washington State in the USA
• abbreviation for Western Australia in Australia
• Wa (倭) is an ancient name of Japan, transcribed as Wo from Chinese and Wae from Korean. See Wei.
• Wa State - a de facto independent state in Burma