Contents Summary 1247 I. Introduction 1247 II. The UVR8–COP1 pathway 1248 III. The UVR8–WRKY36 pathway 1248 IV. The UVR8–BES1/BIM1 pathway 1249 V. Other pathways 1250 VI. Conclusion and perspectives 1250 Acknowledgements 1251 References 1251 SummaryUltraviolet‐B (UV‐B) light is an intrinsic part of sunlight that has significant effects on plant development and acclimation responses. UVR8 (UV Resistance Locus 8) is the long sought‐after UV‐B photoreceptor that mediates UV‐B light perception and signal transduction. UV‐B irradiation induces the monomerization and nuclear accumulation of UVR8 in plant cells to activate the UV‐B signaling pathway. The photoactivated UVR8 could transduce UV‐B signal via multiple mechanisms to regulate transcription and plant growth. Here, we summarize current understanding of UVR8‐mediated UV‐B signal transduction pathways, including UVR8–COP1 (CONSTITUTIVELY PHOTOMORPHOGENIC 1) and UVR8–WRKY36 (WRKY DNA‐BINDING PROTEIN 36), UVR8–BES1 (BRI1‐EMS‐SUPPRESSOR1) and BIM1 (BES1‐INTERACTING MYC‐LIKE 1).