2,2′-Biquinoline is an organic compound with the formula (C9H6N)2.

It is prepared by reductive coupling of 2-chloroquinoline.

[2] It is a colorimetric indicator for organolithium compounds.

[3] 2,2′-Biquinoline is a bidentate ligand.

Unlike the related complexes of 2,2′-bipyridine, the metal does not typically occupy the plane of the biquinoline.