The showpiece encounter sees the CAF Champions League winners and CAF Confederation Cup holders come face to face.
The Brazilians secured their second continental title by beating Morocco's AS FAR 2-1 over two legs, to end their 10-year wait for a second star.
Alger beat Egyptian giants Zamalek 8-7 on penalties for their second title after a 1-1 draw over two legs.
A CAF statement read: "The TotalEnergies CAF Super Cup will be staged in Tshwane, South Africa between TotalEnergies CAF Champions League winners Mamelodi Sundowns and TotalEnergies CAF Confederation Cup holders USM Alger on Sunday, 8 November 2026 at 15h00 local time (13h00 GMT)."
