Swainsona tephrotricha is a species of flowering plant in the family Fabaceae and is endemic to eastern South Australia.

It is an erect or ascending perennial plant, with imparipinnate leaves with 7 to 19 broadly egg-shaped to narrowly elliptic leaflets, and racemes of 30 or more pink or pinkish-purple flowers.

There is a stipule 5–8 mm (0.20–0.31 in) long at the base of the petiole.

[2][3] Swainsona tephrotricha was first formally described in 1853 by Ferdinand von Mueller in the journal Linnaea.

[4][5] This species of pea grows on arid hillsides, often on roadsides, in and around the Flinders Ranges in the east of South Australia.