| # | Species | Formula |
| 4566 | Y(III)(Cp)2O2(+) (PEZDAZ) | C16H22O2Y | |
| 4567 | Yttrium(III) hexaquo (Geo) | H12O6Y | |
| 4568 | Y(II)(H2O)6 | H12O6Y | |
| 4569 | Y(II)(H2O)6 (Geo) | H12O6Y | |
| 4570 | Y(III)O8(3+) (BEJDOJ) (Geo) | H16O8Y | |
| 4571 | Y(III)O8(3+) (BEJDOJ) | H16O8Y | |
| 4572 | Y(III)O8 (YACACT) (Geo) | C15H25O8Y | |
| 4573 | Y(III)O8 (YACACT) | C15H25O8Y | |
| 4574 | Y(III)O9(3+) (AYETHS01) (Geo) | H18O9Y | |
| 4575 | Y(III)O9(3+) (AYETHS01) | H18O9Y | |
| 4576 | Y(III)O9 (BONTUT) (Geo) | H6N3O12Y | |
| 4577 | Y(III)O9 (BONTUT) | H6N3O12Y | |
| 4578 | Y(III)O9 (VARQOU) (Geo) | C12H15O15Y | |
| 4579 | Y(III)O9 (VARQOU) | C12H15O15Y | |
| 4580 | Y(III)O9 (AFARII) (Geo) | C18H15N6O18Y | |
| 4581 | Y(III)O9 (AFARII) | C18H15N6O18Y | |
| 4582 | Yttrium(I) fluoride | FY | |
| 4583 | Yttrium(III) oxide fluoride | OFY | |
| 4584 | Yttrium(III) trifluoride | F3Y | |
| 4585 | Yttrium(III) tetrafluoride, anion | F4Y | |
| 4586 | Yttrium(III) hexafluoride | F6Y | |