This document summarizes the measurements
performed at the LHCb experiment using semileptonic $b$-hadron decays.
Measurements of the CKM factor $|V_{ub}|$, lepton flavour universality tests by
measuring the ratios $R(D^*)$ and
$R(J/\psi)$, a search for the decay $B^+\to\mu^+\mu^-\mu^+\nu_{\mu}$ and the
measurement of charmed-baryon lifetimes using semileptonic decays are
presented.