The North American Product Classification System (NAPCS) is a market or demand-based, hierarchical classification system for products (goods and services) that is not industry-of-origin based but can be linked to the NAICS industry structure and is consistent across the three North American countries. It is a system that has been phased in beginning in 1999 and can be used to drill down in industries. It was published in 2017 and 2022.

For example, anyone looking for all the pharmacies in a particular area will want stand-alone pharmacies, pharmacies in grocer stores, and pharmacies in general purpose stores like Target and Wal-Mart. Since NAPCS operate a little differently than SIC and NAICS codes, the NAPCS code 342010103 includes Retailing services for medicines, vitamins, minerals, and supplements regardless of what the retail looks like.