OLiS
OLiS is the official chart of the 100 highest selling music albums in Poland. The chart exists since 23 October 2000 and is provided by Polish Society of the [Phonographic Industry|ZPAV].
Until January 2023 the chart consisted of 50 albums, based only on physical sale. Since January 2023 the chart consists of 100 albums and is based on both physical sale and listeners in four Music [streaming service|streaming services] : Spotify, YouTube, Apple Music and Deezer.