Tajik may refer to:

• Tajiks, an ethnic group living in Iran, Afghanistan, Tajikistan, Pakistan, Uzbekistan, and western China.
• Tajik Assata Anwar Bahoul, the birth name of Black nationalist activist Taj Anwar.
• Tajik language, the official language of Tajikistan; Persian written in Cyrillic.
• The Sarikoli language, spoken by Tajiks in China and officially referred to as the Tajik language in China.
• The Arabic-schooled, ethnically Persian administrative caste of the Turco-Persian society.

note: To distinguish between the nationality and the ethnicity, some sources (such as CIA factbook) use the adjective Tajikistani for the citizens of Tajikistan. Tajik is occasionally written as Tadzhik or Tadjik, a transcription of the Russian spelling.