Calystegia affinis is a critically endangered species of climbing or creeping vine in the plant family Convolvulaceae.

The specific epithet, affinis, is Latin for 'neighbouring',[5] which was possibly chosen by Endlicher on the basis of his comment that the species was closely allied to Calystegia marginata.

[2] The flowers are axillary,[7] solitary, pink with five[7] cream longitudinal bands and are funnel-shaped.

[2] They have large persistent bracteoles enclosing the calyx which has five sepals and five petals.

[1][6] In 1904, Joseph Maiden renamed it Convolvulus affinis,[8] but this is considered an illegal name by the Commonwealth Heads of Australian Herbaria.