Cyclin E2 is a protein that in humans is encoded by the CCNE2 gene. It is a G1 cyclin that binds Cdk2 and is inhibited by p27(Kip1) and p21(Cip1). It plays a role in the G1/S portion of the cell cycle and also has putative interactions with proteins CDKN1A, CDKN1B, and CDK3. Aberrant expression can lead to cancer.

Zariwala, M.; Liu, J.; Xiong, Y. (1998-11-26). "Cyclin E2, a novel human G1 cyclin and activating partner of CDK2 and CDK3, is induced by viral oncoproteins". Oncogene. 17 (21): 2787–2798. doi:10.1038/sj.onc.1202505. ISSN 0950-9232. PMID 9840943. S2CID 7340570.