The aim of this study is to show how much Nicodemus Tessin the younger was inspired by the architecture of Gianlorenzo Bernini, while building the Tessinska palace in Stockholm. The investigation is based on comparative analysis of Tessinska palace with various architectural works by Bernini. The author also investigates the influence Bernini had on Tessin t.y. by studying the personal relation between the architects.The investigation shows that every external surface of the Tessinska palace contain many architectural details and elements that share similarities or look equal to the ones used by Bernini in a variety of his roman buildings, to name a few: Palazzo Barberini, Palazzo Ludovisi, Collegio di Propaganda Fide, Palazzo Chigi and more. The analysis of the biographical background and relationship between the architects shows that Nicodemus Tessin t.y. was very influenced by Bernini and his work, which he writes about in several occasions in his works and notes. Investigation shows that Tessin t.y was using Berninis architectural details consciously and with full awareness.