In present communication an attempt is made to study the attenuation of microwaves by PPy doped PVC films using complex permittivity measurements in the frequency range (8.2-12.4 GHz) at room temperature. The parameters such as attenuation distance (also known as skin depth or penetration depth ()), power penetration depth (D-p) and absorption index (k) which are important in determining the microwave absorbing properties of the material have also been evaluated using dielectric parameters. Results show that PVC-PPy films with high dielectric loss exhibited strong attenuation of microwaves in the experimental frequency range of 8.2-12.4 GHz. It is also seen that films with low percentage concentration of PPy have large values of skin depth. However, a rapid downfall in values of skin depth for these films is observed with increasing frequency. PVC films loaded with higher concentration of PPy exhibit elevated values of absorption index. POLYM. ENG. SCI., 57:89-94, 2017. (c) 2016 Society of Plastics Engineers