Senecio infirmus is a species of plant from South Africa.
This perennial subshrub has narrow, hairless leaves. Yellow flowerheads are borne on long filiform stalks. Each has 10-12 rays and 18-20 bracts. The fruits are achenes (dry fruits containing a single seed). They are hairy.
This plant grows in the Western Cape and Eastern Cape of South Africa.
There is currently insufficient evidence to assess this species risk of extinction.