A new series of quinazolinone derivatives containing triazole, thiadiazole, thiosemicarbazide functionalities was synthesized and then screened for their in vitro urease inhibition properties. Most of the compounds showed excellent activity with IC50 values ranging between 1.88 +/- 0.17 and 6.42 +/- 0.23 mu g/mL, compared to that of thiourea (IC50 = 15.06 +/- 0.68) and acetohydroxamic acid (IC50 = 21.03 +/- 0.94), as reference inhibitors. Among the synthesized molecules, compounds 5c, 5e and 5a showed the best inhibitory effect against urease enzyme with IC50 values of 1.88 +/- 0.17 mu g/mL, 1.90 +/- 0.10 and 1.96 +/- 0.07 mu g/mL, respectively. Moreover in order to give better understanding of the inhibitory activity of synthesized compounds, molecular docking studies were applied at the target sites of jack bean urease enzyme (JBU). Their binding poses and energy calculations were analyzed using induced fit docking (IFD) and prime-MMGBSA tool. Binding poses of studied compounds were determined using induced fit docking (IFD) algorithms.