The chemistry of organoboron compounds has been primarily dominated by their use as powerful reagents in synthetic organic chemistry. Recently, the incorporation of boron as part of a functional target structure has emerged as a useful way to generate diversity in organic compounds. A commonly applied strategy is the replacement of a CC unit with its isoelectronic BN unit. In particular, the BN/CC isosterism of the ubiquitous arene motif has undergone a renaissance in the past decade. The parent molecule of the 1,2‐dihydro‐1,2‐azaborine family has now been isolated. New mono‐ and polycyclic B,N heterocycles have been synthesized for potential use in biomedical and materials science applications. This review is a tribute to Dewar’s first synthesis of a monocyclic 1,2‐dihydro‐1,2‐azaborine 50 years ago and discusses recent advances in the synthesis and characterization of heterocycles that contain carbon, boron, and nitrogen. Ring around the boron: The BN/CC isosterism of arenes, which results in azaborine structures, has emerged as a viable strategy to increase the range of compounds relevant to biomedical research and materials science. As a tribute to Dewar's first synthesis of a monocyclic 1,2‐azaborine 50 years ago, this review summarizes recent advances in the synthesis and characterization of carbon(C)–boron(B)–nitrogen(N)‐containing heteroaromatics.