We present an overview of possible imprints of nonextensivity in particle and nuclear physics. Special emphasis is placed on the intrinsic fluctuations present in the system under consideration as the possible source of nonextensivity. The possible connection of nonextensivity and the self-organized criticality apparently being observed in some cosmic rays and hadronic experiments will also be discussed. (C) 2002 Elsevier Science B.V. All rights reserved.