  The study of $C\!P$ violation in decays of neutral $B$ mesons provides an
important test of the Standard Model (SM) predictions and it is a sensitive
probe to search for non-SM physics. In these proceedings I present measurements
of $C\!P$ violation in the neutral $B$ meson system. The discussed analyses are
based on $pp$-collision data corresponding to an integrated luminosity of 1
$\mathrm{fb}^{-1}$ or 3 $\mathrm{fb}^{-1}$ recorded by the LHCb experiment.
