The textbook 'Collection of Programming Tasks: RAD Studio 12 - Delphi' is intended for students of technical and natural science faculties, both internal and axternal, mainly for the disciplines 'Programming for Mathematicians' or 'Algorithmization in Mathematics.' The textbook covers 10 basic areas and provides 100 solved exercises in the RAD Studio 12 - Delphi environment. The aim of the textbook is not to explain the language and describe the environment, and it is assumed that the reader is familiar with the RAD Studio environment and Object Pascal technology, which is still one of the major programming languages. The exercises contained in the publication serve as a means to better master the issues of programming in Delphi and show one of the ways to proceed when solving specific problems and creating programs.