The book deals with collective and stochastic processes in astrophysical disks involving theory, observations, and the results of modelling. Among others, it examines the spiral-vortex structure in galactic and accretion disks, stochastic and ordered structures in the developed turbulence. It also describes sources of turbulence in the accretion disks, internal structure of disk in the vicinity of a black hole, numerical modelling of Be envelopes in binaries, gaseous disks in spiral galaxies with shock waves formation, observation of accretion disks in a binary system and mass distribution of luminous matter in disk galaxies.The editors adeptly brought together collective and stochastic phenomena in the modern field of astrophysical disks, their formation, structure, and evolution involving the methodology to deal with, the results of observation and modelling, thereby advancing the study in this important branch of astrophysics and benefiting professional researchers, lecturers, and graduate students.