A search is performed for narrow resonances decaying to final states of two jets, with at least one jet originating from a 𝑏 quark, in proton-proton collisions at √𝑠 =13  TeV. The data set corresponds to an integrated luminosity of 138  fb−1 collected with the CMS detector at the LHC. Jets originating from energetic 𝑏 hadrons are identified through a 𝑏-tagging algorithm that utilizes a deep neural network or the presence of a muon inside a jet. The invariant mass spectrum of jet pairs is well described by a smooth parametrization and no evidence for the production of new particles is observed. Upper limits on the production cross section are set for excited 𝑏 quarks and other resonances decaying to dijet final states containing 𝑏 quarks. These limits exclude at 95% confidence level models of 𝑍′ bosons with masses from 1.8 TeV to 2.4 TeV and of excited 𝑏 quarks with masses from 1.8 TeV to 4.0 TeV. This is the most stringent exclusion of excited 𝑏 quarks to date.