The micellar properties of the cationic Gemini surfactant ethanediyl-1,2-bis(dimethyldodecyl ammonium bromide), C 12 H 25 · (CH 3 ) 2 N + –(CH 2 ) 2 –N + (CH 3 ) 2 C 12 H 25 · 2Br − (12-2-12), with short chain alcohols have been studied by conductivity and surface tension measurements within the temperature range 293.15 K–313.15 K and alcohol percentage. The critical micelle concentration (CMC) of 12-2-12 solution, degree of ionization (α) and standard Gibbs free energy of micellization (ΔG° m ), standard enthalpy of micellization (ΔH° m ) were calculated from conductivity and surface tension data. The experimental data show that the CMC values of cationic Gemini surfactants increased with addition of methanol, ethanol and n -propanol. The thermodynamic parameters (ΔG° m ), (ΔH° m ) and (ΔS° m ) of micellization of 12-2-12 in alcohol were also calculated from the temperature dependence of the CMC values. CMC, (α), (ΔH° m ) and (ΔS° m ) increased linearly with increasing temperature. In the mixture of dimeric cationic surfactant (12-2-12) and alcohol solutions, the CMC values showed a slight increase with increasing alcohol concentration. CMC, maximum surface excess concentration at the solution/air interface, Γ max , minimum area per surfactant molecule, A min , and the surface pressure at CMC, ¶ CMC , values calculated from the surface tension measurements and thermodynamic parameters have been evaluated at same temperatures.