The paper presents findings of an investigation into the linear and nonlinear dielectric properties of (R)-3-quinuclidinol embedded in porous aluminum oxide (pores of size 300 nm), in comparison with the properties of bulk (R)-3-quinuclidinol. A decrease in the Curie temperature in the nanocomposite, both upon heating and cooling, in comparison with a bulk sample is revealed. A decrease in the phase transition temperature allows for interpretation on the basis of the known theoretical models for ferroelectric small particles.