The volume constitutes the proceedings of the 13th International Conference on Noise in Physical Systems and 1/f Fluctuations (ICNF'95) held in Palanga, Lithuania, in the period 29 May - 3 June 1995.International conference of fluctuation phenomena has a rich history. Previous ones were held in St. Louis (USA, 1993), Kyoto (Japan, 1991), Budapest (Hungary, 1989), Montreal (Canada, 1983), etc. The conference proved to be successful in bringing together specialists in fluctuation phenomena in very different areas, and providing a bridge linking theorists and applied scientists involved in the design of new generation of electronic devices. Correspondingly, the volume covers fundamental aspects of noise in various fields of science and modern technology. Mesoscopic fluctuations, noise in high temperature superconductors, in nanoscale structures, in optoelectronic and microwave devices, fluctuation phenomena in biological systems and human body are in the spotlight.