AC conductivity and dielectric properties of bulk TlInSe2 were studied in the frequency and temperature range of 42-1 MHz and 294-473 K, respectively. The XRD pattern showed that the powder of TlInSe2 has a tetragonal structure. AC conductivity, σac (ω), as a function of frequency varies as power law: σac (ω) = B ω s . Temperature dependence of frequency exponent was analyzed to predict the conduction mechanism, which was found to be correlated barrier hoping model (CBH). Frequency and temperature dependences of dielectric constant and dielectric loss were also investigated. Electric modulus formalism was applied for evaluating the activation energy of the dielectric relaxation process.