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Photoperiod is a pivotal regulatory factor in the flowering of <i>Camellia oleifera</i> Abel. (<i>C. oleifera</i>). GIGANTEA (GI) serves as a pivotal regulator, not only orchestrating the intricate circadian rhythm but also governing photoperiod-dependent flowering. In order to explore the function of <i>GI</i> in <i>C. oleifera</i> (<i>CoGI</i>), we obtained a <i>CoGI</i> gene-coding sequence and analyzed a CoGI protein sequence using bioinformatics. Furthermore, we conducted a spatiotemporal expression analysis of <i>CoGI</i>. And a yeast two-hybridization assay was used to screen the interacting proteins of CoGI. Evolutionary analysis revealed high conservation of the CoGI protein, which clustered with the GI protein from <i>Camellia sinensis</i> (CsGI) on a common evolutionary branch. The expression of <i>CoGI</i> was different in each part, and a tissue expression analysis revealed that the relative expression level of the <i>CoGI</i> gene is highest in the leaves of <i>C. oleifera</i>, while it is at its lowest in the seed coats. Transgenic <i>Arabidopsis thaliana</i> (<i>Arabidopsis</i>) overexpressing <i>CoGI</i> exhibited early flowering under long-day conditions. In addition, the yeast two-hybrid library screening revealed interactions between seven <i>C. oleifera</i> proteins and CoGI: CoACR9, CoLAO, CoDExH12-like, CoIT1K-like, CoUPF0481, CoIDM3, and CoAt4g27190-like. The findings demonstrated that <i>CoGI</i> is crucial to <i>C. oleifera</i>’s flowering.