The Alberta K-12 ESL Proficiency Benchmarks are organized by division: kindergarten, grades 1-3, grades 4-6, grades 7-9, and grades 10-12. They are descriptors of language proficiency in listening, speaking, reading, and writing. The descriptors are arranged in a continuum of seven language competences across five proficiency levels. Several supporting resources have been developed to support classroom teachers in using the Benchmarks, which include: (1) illustrative examples; (2) writing samples; (3) speaking videos; (4) tracking sheets; (5) division-level summaries. This article provides information on the Alberta K-12 ESL Proficiency Benchmarks with a description of the Benchmarks, their supporting resources, and a commentary on their use in the classroom. (Contains 9 tables.)