The kinetic parameters of the thermal decomposition of boric acid have been investigated by using TGA data. Suzuki and Coats-Redfern methods have been applied for the kinetic investigation. It was determined that decomposition kinetics of boric acid occurred in two steps and both regions suitably fit a first-order kinetic model. According to Coats-Redfern method, the activation energy and frequency factor were found as 79.85 kJ·mol.1 and 3.82×104 min.1 for region I and 4.79 kJ·mol.1 and 4.045×10.5 min.1 for region II, respectively. The activation energies and frequency factors were found as 4.45 kJ·mol.1 and 4.08×108 min.1 for the Suzuki method.