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Self defined ethnicity (SDE) codes are a set of codes used by the Home Office in the United Kingdom to classify an individual's ethnicity according to that person's self-definition.

The codes are also called "18 + 1" codes, as there are 18 of them, plus one code (NS) for "not stated".^[1] In addition to the previously used 16+1 codes, they contain the categories W3 and O2, while A4 is now replacing O1 (Chinese).^[2]

The code system originated in the United Kingdom Census 2001 based on Recommendation 61 of the Stephen Lawrence Inquiry Report (SLIR).^[2]^[3]

British police forces are required to use the SDE 18+1 codes (as opposed to the commonly used radio shorthand IC codes) when spoken contact has taken place and an individual has been given an opportunity to state their self-perceived ethnicity.

^ "Criminal Justice System Exchange Data Standards Catalogue, Version 6" (PDF). GOV.UK. HM Government. Retrieved 16 July 2021.
^ ^a ^b The code systems used within the Metropolitan Police Service (MPS) to formally record ethnicity. 2 March 2007.
^ The Stephen Lawrence Inquiry. February 1999.