A permanent slide is a microscope slide that has been prepared with a specimen, such as a tissue sample, cell culture, or microorganism, which has been fixed, stained, and mounted in a permanent medium, such as Canada balsam or epoxy resin.

Permanent slides are used in various fields such as biology, medicine, and research for educational purposes, diagnostic testing, and scientific study.

They provide a permanent record of the specimen, allowing for repeated examination and study over time.