N-Phenyl-3-carbazoleboronic acid is an organic compound featuring a carbazole core substituted with a boronic acid group at the 3-position and a phenyl group at the nitrogen atom. This structure combines the excellent hole-transporting properties of carbazole derivatives with the cross-coupling reactivity of boronic acids. Its primary application is as a key synthetic building block in the development of advanced organic electronic materials. It is extensively used in Suzuki-Miyaura cross-coupling reactions to construct complex conjugated molecules for organic light-emitting diodes (OLEDs), organic photovoltaics (OPVs), and other optoelectronic devices. The carbazole unit contributes to high thermal stability and good charge carrier mobility, making it a valuable precursor for host materials, emitters, and hole-transport layers. As a boronic acid derivative, it also serves as a versatile intermediate in general organic synthesis for constructing C-C bonds. Proper handling is required due to the potential sensitivity of the boronic acid group to moisture and protic conditions.