  In this Research Highlights, we summarize 31 contributions provided during
the Workshop \textit{Multifrequency Behaviour of High Energy Cosmic Sources -
XIV}, held in Palermo (Italy) from the 12th to the 17th of June 2023. We will
start with the most recent discoveries in the field of gravitational waves
(GWs). We will connect this topic to the contributions of Gamma-Ray Bursts
(GRBs) associated with GWs and with the Kilonovae (KNe) hunting and, more in
general, on GRBs. Continuing on high-energy astrophysics objects, we will delve
into Active Galactic Nuclei (AGNs), neutrino astronomy and the study of the
primordial universe, both from the space telescopes' observation and from the
very recent proposals in terms of cosmological models. From the faraway
universe, we will move to the more local scales and discuss the recent
observations in Supernova Remnants (SNRs), massive star binaries, globular
cluster dynamics, and exoplanets observed by Kepler.
