The article analyses Cicero’s use of the concept of odium. The author has concluded that Cicero uses odium in different writings for more than 200 times, most often in his orations. The concept has a rather wide palette of meanings: from hate to enmity and anger. The notion of odium has such epithets as personal or public, open or secret, fair or unfair, big or small, sudden or long-term. Odium acts as a homogeneous member of a sentence with words denoting positive or negative emotions, or moral categories, and they are often connected by conjunctions, prepositions, particles (et / et … et, atque, aut / aut … aut, cum, sine, -que, vel, neque / neque … neque) or with a comma. Cicero employs the concept of odium together with invidia, ira, iracundia, which often form synonymous series. Cicero speaks of hatred (odium) when discussing crimes (scelera) and wars (bella). Odium is often combined with words denoting vices (libido, crudelitas, etc.) and negative emotions (cupiditas, metus, etc.). Odium as a negative emotion is opposed to positive moral categories (dignitas, misericordia, benevolentia, virtus, etc.) and positive emotions (spes, fides, etc.), especially in orations in order to persuade listeners. In his writings on rhetoric Cicero includes odium in the list of emotions that a speaker should exercise; with odium he also indicates the ability of the orator to change emotions of the audience depending on the situation, turning hatred into friendship or vice versa.