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Empirical line lists for the open shell molecule $^{89}$Y$^{16}$O (yttriumoxide) and its isotopologues are presented. The line lists cover the 6 lowestelectronic states: $X {}^{2}\Sigma^{+}$, $A {}^{2}\Pi$, $A' {}^{2}\Delta$, $B{}^{2}\Sigma^{+}$, $C {}^{2}\Pi$ and $D {}^{2}\Sigma^{+}$ up to 60000 cm$^{-1}$($<0.167$ $\mu$m) for rotational excitation up to $J = 400.5$. An \textit{abinitio} spectroscopic model consisting of potential energy curves (PECs),spin-orbit and electronic angular momentum couplings is refined by fitting toexperimentally determined energies of YO, derived from published YOexperimental transition frequency data. The model is complemented by empiricalspin-rotation and $\Lambda$-doubling curves and \textit{ab initio} dipolemoment and transition dipole moment curves computed using MRCI. The \textit{abinitio} PECs computed using the complete basis set limit extrapolation and theCCSD(T) method with its higher quality provide an excellent initialapproximation for the refinement. Non-adiabatic coupling curves for two pairsof states of the same symmetry $A$/$C$ and $B$/$D$ are computed using astate-averaged CASSCF and used to built diabatic representations for the $A{}^{2}\Pi$, $C {}^{2}\Pi$, $B {}^{2}\Sigma^{+}$ and $D {}^{2}\Sigma^{+}$curves. Calculated lifetimes of YO are tuned to agree well with the experiment,where available. The BRYTS YO line lists for are included into the ExoMol database (www.exomol.com).

ExoMol line lists -- LIII: Empirical Rovibronic spectra of Yttrium Oxide (YO)