This presentation discusses intermetallic compounds in aluminum alloys. It begins by defining intermetallic compounds as intermediate phases formed between two primary metal components with a different crystal structure and fixed composition. In aluminum alloys, the aluminum phase forms intermetallics with other elements. Examples of stoichiometric intermetallic compounds in aluminum alloys include Aluminum-antimony and nonstoichiometric compounds include the θ-phase in aluminum-copper alloys and the β-phase in aluminum-magnesium alloys. The presentation concludes by noting properties and applications of intermetallic compounds will be covered.