Genetic and biochemical analyses show that IL-23p19 plays a central role in mediating bacteria-induced colitis in Interleukin-10 deficient (IL-10-/-) mice. The molecular mechanisms responsible for the dysregulated innate host response leading to enhanced IL-23 gene expression in IL-10-/- mice are poorly understood. In this study, we investigated the role of Bcl3 in controlling LPS-induced IL-23p19 gene expression in bone marrow-derived dendritic cells (BMDC) isolated from IL-10-/- mice. We report higher IL-23p19 mRNA accumulation and protein secretion in LPS-stimulated BMDC isolated from IL-10-/- compared to WT mice. LPS-induced Bcl3 expression was strongly impaired (90% decrease) in IL-10-/- BMDC compared to WT BMDC. Chromatin immunoprecipitation demonstrated enhanced RelA binding to the IL-23p19 promoter in IL-10-/- compared to WT BMDC. Bcl3 overexpression decreased LPS-induced IL-23p19 gene expression in IL-10-/- BMDC, which correlated with enhanced NF-kB p50 binding and decreased RelA binding to the gene promoter. Conversely, Bcl3 knockdown enhanced LPS-induced IL-23p19 gene expression in WT BMDC. Moreover, LPS-induced IL-23p19 gene expression was significantly enhanced in Bcl3-/- BMDC compared to WT BMDC. In conclusion, enhanced LPS-induced IL-23p19 gene expression in IL-10-/- mice is due to impaired Bcl3 expression leading to diminished p50 and enhanced RelA recruitment to the IL-23p19 promoter.