Cobalt(II) cyanate is the hypothetical inorganic compound with the formula Co(OCN)2.

[1] In contrast, the tetraisocyanatocobalt(II) ion (Co(NCO)42-) has been identified by X-ray crystallography and is widely known.

[4] Multiple compounds of the related tetracyanatocobaltate(II) has been structurally elucidated, such as [Co(C5H5)2]2[Co(NCO)4].

[8] Although the simple cyanate is unknown, the structure of the tetracyanatocobaltate(II) ion has been elucidated.

The [Co(NCO)4]2- ion consists of a nitrogen-bonded tetrahederal central cobalt atom.