The ac and dc electrical conductivities and dielectric properties of the fluorescein sodium salt (FSS) have been investigated. The direct current (dc) conductivity shows that the compound is a typical organic semiconductor, as its electrical conductivity increases with increasing temperature. The dc electrical activation energy Δ E σ and the room temperature electrical conductivity equal 0.35 eV and 1.26 × 1 0 − 9 ( Ω cm ) − 1 , respectively. The alternating current (ac) conductivity of the investigated compound obeys the power law : σ a c ( ω ) = A ( T ) . ω s ( T ) , where s < 1 . The obtained results have been discussed in terms of the correlated barrier hopping (CBH) model. The density of localized states N F ( E ) at the Fermi level and the binding energy W m were calculated. The dielectric constant ε 1 ( ω ) and dielectric loss ε 2 ( ω ) have been found to decrease with increasing frequency and to increase with increasing temperature over the studied ranges. The value of the maximum barrier height W M obtained from Austin and Guintini equations agree with each other. The correlation between the ac conduction and the dielectric properties in organic FSS were verified.