We divided our contempleation on Catholic and secular angelology into three separate parts. The first two parts of this diploma paper present the basic outlines of Catholic and secular angelology, while the third part focuses on the fundamental differences between the two mentioned parts. In the first part, the outline of the Catholic angelology is presented. In the beginning, we clarified the etymological meaning of the term angel and tried to briefly answer the question of who the angels are in Catholic theology. Furthermore, we discuss the so-called hierarchy of angels, the relationship between angels and God and man, and the care of angels for people and the whole creature. At the end of the first part of this diploma paper, we pointed out the problems and attemps to reconstruct angelology. The second part of the diploma paper is devoted to contemplating on secular angelology. We tried to provide the answer to the crucial questions such as the corporeality of angels, the work of angels in the world, God's existence, hierarchy and Jesus Christ in secular angelology. We also put the emphasis on the presence of the anthropomorphism in the selected work (D. Trussoni, Angelology) for consideration on secular angelology. Towards the end of the second part, we referred to the work Angels in my hair by the author Lorne Byrne, thus widening out perspective on consideration of secular angelology. Finally, in the third part we decided to point out the basic differences between Catholic and secular angelology. Also, we discuss why eagerness with secular angelology rules, and what Catholic teology can learn from it. Lastly, we discuss one topic which has been somewhat neglected, which is the activity of angels in the lives of the saints.