  Non-thermal particles and high-energy radiation can play a role in the
dynamical processes in star-forming regions and provide an important piece of
the multiwavelength observational picture of their structure and components.
Powerful stellar winds and supernovae in compact clusters of massive stars and
OB associations are known to be favourable sites of high-energy particle
acceleration and sources of non-thermal radiation and neutrinos. Namely, young
massive stellar clusters are likely sources of the PeV (petaelectronvolt)
regime cosmic rays (CRs). They can also be responsible for the cosmic ray
composition, e.g., 22Ne/20Ne anomalous isotopic ratio in CRs. Efficient
particle acceleration can be accompanied by super-adiabatic amplification of
the fluctuating magnetic fields in the systems converting a part of kinetic
power of the winds and supernovae into the magnetic energy through the
CR-driven instabilities. The escape and CR propagation in the vicinity of the
sources are affected by the non-linear CR feedback. These effects are expected
to be important in starburst galaxies, which produce high-energy neutrinos and
gamma-rays. We give a brief review of the theoretical models and observational
data on high-energy particle acceleration and their radiation in star-forming
regions with young stellar population.
