diffusus (Smith, 1836) - Western and southern Angola east to south-western and southern Zambia, south to Namibia (except south-west), Botswana, western Zimbabwe and western South Africa (except much of south-west).
luangwae Benson, 1956 - Upper Luangwa Valley, in eastern Zambia.
mosambicus van Someren, 1921 - South-eastern Tanzania and northern Mozambique. Sometimes considered a subspecies of Northern Grey-headed Sparrow (Passer griseus).
stygiceps Clancey, 1954 - South-eastern Zambia, southern Malawi, northern and eastern Zimbabwe, central and southern Mozambique, north-eastern and eastern South Africa, Swaziland and Lesotho. Sometimes believed to represent darker end of cline in plumage coloration of nominate or possibly a hybrid between nominate subspecies of present species and subspecies ugandae of Northern Grey-headed Sparrow (Passer griseus).
BirdLife International Species Factsheet