The reduction of unsaturated compounds is one of the most widely applied transformations in organic synthesis. Aggressive reductants, highly pressurized hydrogen gas, and stoichiometric amount of metal salts used have greatly burdened the environment, stimulating the development of catalytic approaches with milder and greener conditions. In this context, the hydroboration has attracted great attention, and great progress has been achieved in the past decades. Due to the great performance of rare-earth complexes in numerous organic transformations, such complexes are also employed as catalysts in the hydroboration of different unsaturated compounds. The current review summarized recent works of rare-earth complexes catalyzed hydroboration of various unsaturated compounds, covering the publications mainly in past 5 years albeit with alkenes as exception. The transformations are mainly classified into two categories: hydroboration of C–C and C–hetero unsaturated compounds, and some closely related works are also discussed, such as rare-earth catalyzed direct borylation of C–H bonds.