Heavy-ion and fixed-target physics at LHCb

The latest results obtained by the LHCb collaboration from heavy-ion and fixed-target collisions recorded during the Run 2 LHC data-taking are presented. They mainly focus on heavy hadron production for varying nuclear collision systems, probing nuclear matter physics in different regimes, including Cold Nuclear Matter and Quark Gluon Plasma effects. Measurements of strangeness production and $\mathrm{\Lambda }$ baryon polarisation are also reported. Even more valuable results will come soon from the ongoing Run 3 data-taking.