We have performed relativistic coupled-cluster calculations for the ground and excited states of OThF using the CFOUR program package . The equilibrium structure and harmonic vibrational frequencies for the electronic ground state of OThF have been calculated using the coupled-cluster singles and doubles (CCSD) method. The spin-free exact two-component theory in its one-electron variant (the SFX2C-1e scheme) and its analytic-gradient theory has been used to treat scalar-relativistic effects. We have performed extensive scalar-relativistic equationof-motion CCSD (EOM-CCSD) calculations for the electronically excited states of OThF using the ground electronic state as the reference. Dyall's triple-zeta basis set for Th 41 together with cc-pVTZ basis sets for O and F 42 recontracted for the SFX2C-1e scheme, have been used in these calculations.