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Tet-eleven translocation 1 (TET1) is a dioxygenase that plays an important role in decreasing the abundance of DNA methylation and changing the expression levels of specific genes related to inflammation. <i>Porphyromonas gingivalis</i> (Pg.) lipopolysaccharide (LPS) can induce periodontal diseases that present with severe bone loss and collagen fiber destruction accompanied by a high number of M1 macrophages. M1-polarized macrophages are pivotal immune cells that promote the progression of the periodontal inflammatory response, but the function of TET1 during M1 macrophage activation is still unknown. Our results showed that the mRNA and protein expression levels of TET1 decreased in THP-1 cells during M1 macrophage differentiation. <i>TET1</i> knockdown resulted in a significant decrease in the production of proinflammatory markers such as IL-6, TNF-&#945;, CCL2, and HLA-DR in Pg. LPS/IFN-&#947;- and <i>Escherichia coli</i> (<i>E. coli</i>) LPS/IFN-&#947;-induced M1 macrophages. Mechanistically, <i>TET1</i> knockdown downregulated the activity of the NF-&#954;B signaling pathway. After treatment with the NF-&#954;B inhibitor BAY 11-7082, M1 marker expression showed no significant difference between the <i>TET1</i> knockdown group and the control group. Taken together, these results suggest that <i>TET1</i> depletion inhibited Pg. LPS/IFN-&#947;-induced M1 macrophage polarization through the NF-&#954;B pathway in THP-1 cells.