The Illinois Oath of Office is a solemn oath taken by individuals elected or appointed to public office in the state of Illinois. This oath is a promise to uphold the state's Constitution and laws, and to faithfully serve the public. The oath can be taken by all public officers, including legislators, judges, county and municipal officers, and state officers. There are three types of Illinois Oath of Office: the Oath of Office for State Officers, the Oath of Office for County Officers, and the Oath of Office for Municipal Officers. The content of each of these oaths is similar, but varies slightly depending on the type of office held. All Illinois Oaths of Office emphasize the importance of faithfully executing the duties of the office and being loyal to the Constitution and laws of Illinois.