This work is generally about aluminium and aluminium alloys, casting aluminium and its alloys, castability and castability testing of aluminium alloys. Introductory part describes procedure of creating aluminium and creation of aluminium alloys by alloying with certain elements of aluminium in purpose to improve the mechanical properties. Also, in the first part of work are shown stage diagrams for each alloy in purpose to find an easy perception of ways of creating alloys. After that is explained what is casting, some type of casting and some of the general methods of casting. In details are described and schematically shown three types of casting which are usually applied in the casting of aluminium and its alloys. In continuation is described what is castability and how castability can be define, what is the purpose of castability, alloys that are affecting castability and parameters that influence castability. At the end of the work are shown and described tests of castability of aluminium alloys, types and methods of testing castability of aluminium alloys and the conclusion is to achieve a better castability is necessary to select the required alloys and ways of casting that will be suitable to the required quality. Using castability tests which are explained in this work it can be concluded what are the required and necessary parameters for better castabili