Ionic liquids and deep eutectic solvents are of growing interest as solvents for the resource‐efficient synthesis of inorganic materials. This Review covers chemical reactions of various deep eutectic solvents and types of ionic liquids, including metal‐containing ionic liquids, BF4−‐ or PF6−‐based ionic liquids, basic ionic liquids, and chalcogen‐containing ionic liquids. Cases in which cations, anions, or both are incorporated into the final products are also included. The purpose of this Review is to raise caution about the chemical reactivity of ionic liquids and deep eutectic solvents and to establish a guide for their proper use. The chemical reactivity of ionic liquids and deep eutectic solvents can intentionally be exploited as a synthetic tool to prepare inorganic materials that are difficult or even impossible to obtain by traditional synthetic routes. This Review summarizes recent developments in inorganic syntheses that take advantage of reactions with ionic liquids or deep eutectic solvents.