The Dobson intercomparison campaign for southern Africa was held in South Africa from 7 to 18 October 2019.  The campaign was hosted by the South Africa Weather Service at the weather station in Irene. Eight Dobson instruments from six countries, Botswana, India, Germany, Kenya, South Africa and the United States, participated in the campaign. The participation of a Dobson instrument from Nigeria was not possible due to the operator’s visa being delayed, resulting in eight out of the nine originally planned Dobson instruments participating in the campaign. The number of participating instruments amounts to almost 10 per cent of the world’s operating Dobson spectrophotometers. The World Secondary Standard Dobson (United States) and the European Dobson Standard (Germany) were intercompared after more than three years. The experts used the World Secondary Standard Dobson (D 065) and the European Standard to intercompare the performance of the instruments. All Dobson spectrophotometers from different monitoring and research institutions in Southern Africa and India were inspected, serviced as necessary and calibrated. The Dobson instrument from India needed extensive work and its mirrors were renewed. The three South African and Kenyan Dobson spectrophotometers were serviced, intercompared, calibrated and are now in very good condition. The instrument from Botswana was cleaned and serviced and is now in good condition. All the participants were given as much training as possible, and with renewed and regular email contact with the South Africa Weather Service and between the members, the observations are expected to be of good quality. With strong commitment to maintaining regular contact, the operators from Botswana can be guided to resume the measurements at Maun. Through this activity, the data obtained at the measurement sites will be standardized and will be comparable locally and globally. The reports of individual instruments from this activity were prepared and shared with the community. The final combined report is under preparation. This event is part of WMO Global Atmosphere Watch quality control requirements for monitoring atmospheric total ozone.