<p>This paper presents a new record of the rose chafer Protaetia speciosissima (Scopoli, 1786) (Coleoptera: Scarabaeidae), a rare beetle species associated with tree hollows. Specimens of this beetle were found in the oak forest in the Krotoszyn Forest District, west-central Poland, in nest-box for the tawny owl (Strix aluco L., 1758) that had accumulated dead organic material. This finding suggests that it is possible for P. speciosissima to develop and reproduce outside its typical microhabitats.</p>