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In this study, new quaternary ammonium bis-phenol A glycerolate dimethacrylate (QABGMA) was synthesized and proposed as a possible antimicrobial dental monomer. Such monomer has the potential to copolymerize with other methacrylate monomers and impart antimicrobial activity in dental resins and other systems. QABGMA monomer was synthesized and incorporated (at 0–15 wt.%) into a 1/1 (wt./wt.) mixture of bisphenol A glycerolate dimethacrylate (BisGMA)/triethylene glycol dimethacrylate (TEGDMA). The mixture was cured by visible light irradiation and degree of conversion (DC) was measured by Fourier Transform Infrared Spectrophotometer (FT-IR). Weight increase and solubility of the cured specimens were measured by immersion in water and ethanol/water solution (75/25, v/v) at 37 ± 1 °C for 30 days. The antimicrobial activity of QABGMA monomer was investigated against Gram-positive bacteria …