In order to investigate the influence of the drying air characteristics on the drying performance of Tunisian myrtle leaves, drying tests were carried out on a tunnel dryer at the Laboratory of Energetic and Thermal and Mass Transfers LETTM. The sorption isotherm was determined at five temperature levels 40, 45, 50, 55, and 60 °C and at water activity ranging from 0.058 to 0.89, using the static gravimetric method. A non-linear regression procedure was used to fit experimental sorption isotherms with the most used empirical mathematical models available in the literature. The Peleg model was reported to be a suitable fit for the sorption experimental data in the mentioned investigated ranges of water activities and temperature. The myrtle leaves drying experiments were carried out at the five air temperatures in the range of 40-60°C air velocity of 2.0 m/s and performed at a relative humidity of 20%. Results indicated that drying took place in the falling rate period. Moisture transfer from myrtle leaves was described by applying Fick's diffusion model. The drying characteristic curve has been established from experimental convective drying kinetics. The values of the diffusivity coefficients at each condition were obtained using Fick's second law of diffusion. They varied from to m²/s in the temperature range of 40-60 °C and the relative humidity of 20%. An Arrhenius relation with an activation energy value of kJ/mol was obtained.