Section 21

Section 21 may refer to:


 * The nurses' section of Arlington National Cemetery, a US military cemetery
 * Section Twenty-one of the Canadian Charter of Rights and Freedoms, concerning language rights
 * Section 21 of the Housing Act 1988 of the UK, concerning a formal notice to quit — see Section 21 notice
 * Section 21 of the Indian Penal Code, definition of "public servant"