This article presents the results of academic research conducted by a group of scholars in the years 2012–2016 on Karaim manuscripts owned by Polish individuals. The research was financed by the National Science Centre (Poland) (research project nr.: 2011/03/D/HS2/00618). The article provides a concise yet exhaustive description of the privately owned printed and handwritten materials and presents a great deal of hitherto unknown scientific data. The materials stored in private archives open up new perspectives on Karaim studies. They will undoubtedly serve as an important starting point for future research – primarily for historians and linguists, but also for those conducting literary, cultural, and religious studies.