The objective of this thesis was to calculate the fire resistance of a specified timber roof structure composed of primary and secondary elements made from glued laminated timber, as well as a spatial stabilization system. The structure is located in Osijek, and its plan and elevation dimensions were pre-defined in the project assignment. The main beam is of a curved shape with a varying cross-sectional height, while the secondary elements consist of purlins. All calculations and analyses were conducted according to applicable standards, specifically the HRN EN norms. Fire resistance of building structures is crucial for ensuring the safety of both people and property. It is therefore essential to design structures capable of withstanding fire conditions and providing sufficient time for safe evacuation. In light of this, particular attention in this thesis was given to analyzing and calculating the fire resistance of the timber structure, with a focus on the behavior of glued laminated timber in such conditions. The introductory section of the thesis provides a detailed explanation of the development of glued laminated timber as a modern construction material, the process of its production, and the key characteristics that make it suitable for use in load-bearing structures. In addition to its technical properties, the thesis also examines the behavior of timber structures under fire conditions, including the mechanical changes in the material, the process of combustion, and methods for protecting timber elements from high temperatures. The design of timber structures for fire resistance is based on the HRN EN 1995-1-2 standard, which provides guidelines and regulations for achieving adequate fire resistance. The second part of the thesis is dedicated to the dimensioning of the main load-bearing elements of the structure – the primary beam, purlins, and the spatial stabilization system. In addition to standard calculations, the ultimate and serviceability limit states of the beam were also verified to ensure that the structure can withstand the design loads. Subsequently, the thesis focuses on the main objective – calculating the fire resistance of the structure, which is critical for understanding how it will behave in the event of a fire. Finally, the results of the fire resistance calculations for individual components of the structure are presented.