Nowadays, only digital angle estimation methods are used in modern radar sensors in the millimeter wave range. The most important approaches to digital angle estimation are therefore presented in this chapter. First, the two basic approaches to angle determination by correlation or alternatively by a Fourier transform are discussed. These two approaches have an high practical relevance, as they are used very often. These approaches are often combined with more powerful but also more complex approaches to achieve high-resolution and at the same time robust, i.e. reliable, angle estimation. Here, Bartlett and Capon Beamformer as well as MUSIC are discussed.