Polemonium, commonly called Jacob's ladders or Jacob's-ladders (the name derived from the Biblical story), is a genus of between 25 and 40 species of flowering plants in the family Polemoniaceae, native to cool temperate to arctic regions of the Northern Hemisphere.

[1][2] One species, Polemonium micranthum, also occurs in the southern Andes in South America.

Most of the uncertainty in the number of species relates to those in Eurasia, many of which have been synonymized with Polemonium caeruleum.

They produce blue (rarely white or pink) flowers in the spring and summer.

As of April 2020[update] Kew's Plants of the World Online accepts 37 species.