Yttrium(II) oxide
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| Yttrium monoxide
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| CASNo = 12036-00-9
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| InChI = 1S/O.Y
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| SMILES = O.[Y]
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| Appearance = Dark brown solid
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| Formula = YO
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| MolarMass = 104.9 g/mol
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| CrystalStruct = Tetragonal
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| OtherCompounds = Yttrium(III) oxide
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Yttrium(II) oxide or yttrium monoxide is a chemical compound with the formula YO. This chemical compound was first created in its solid form by pulsed laser deposition, using yttrium(III) oxide as the target at 350 °C. The film was deposited on calcium fluoride using a krypton monofluoride laser. This resulted in a 200 nm flim of yttrium monoxide.{{cite journal |author1=Kenichi Kaminaga |author2=Ryosuke Sei |author3=Kouichi Hayashi |author4=Naohisa Happo |author5=Hiroo Tajiri |author6=Daichi Oka |author7=Tomoteru Fukumura |author8=Tetsuya Hasegawa |title=A divalent rare earth oxide semiconductor: Yttrium monoxide |journal=Appl. Phys. Lett. |date=2016 |volume=108 |issue=122102 |page=122102 |doi=10.1063/1.4944330 |publisher=Applied Physics Letters |bibcode=2016ApPhL.108l2102K |language=English}}