International Territorial Level (ITL) is a geocode standard for referencing the subdivisions of the United Kingdom for statistical purposes, used by the Office for National Statistics (ONS).

Following Brexit, the ONS set to develop a domestic statistical classification framework separate from NUTS.

The current NUTS level 1 codes start with "C" (following "UK") rather than "1" because the new list reflected the revised regions of England and local government changes throughout the UK; "1" to "B" had been used for the 11 regions in the previous coding system.

Between 2021 and the next review scheduled for 2024, the ITLs are a mirror of the NUTS classification adopted in 2018.

All NUTS codes containing "UK" were changed to use "TL" for Territorial Level.