With the aim of promoting the use of glued-laminated timber (GLT) made from European beech (Fagus sylvaticaL.), experimental and numerical studies were conducted on high-strength columns for residential, office, and industrial applications. The experimental research comprised compression tests on stocky and slender unreinforced and steel-reinforced beech GLT columns of strength classes GL40h, GL48h, and GL55h. A finite element model was developed to perform parametric studies on geometrical and mechanical properties and to evaluate the load-carrying capacity across different slenderness ratios. The investigations revealed that the columns can be designed using the effective length method, however with adapted critical relative slenderness and straightness factor. Corner steel reinforcement of grades ST900/1100 and ST950/1050 leads to a marked increase in the load-carrying capacity of stocky as well as slender GLT columns.