NGC 6426 is a globular cluster of stars located in the equatorial constellation of Ophiuchus.

[3] It has an apparent visual magnitude of 10.9 and an angular diameter of 4.2′, making it difficult to observe with a small telescope.

[5] Chemical abundances of four members at the tip of the red giant branch suggests there may have been at least two generations of stars, with the older stars enriching a younger generation with elements including Mg, Si, and Zn.

There is also some indication of hypernova enrichment of the pre-cluster medium by lighter alpha process elements.

[8] Based on the spectra of a dozen identified RR Lyrae variables, this is classified as an Oosterhoff type II cluster.