Johannes Samuel Hahn (Teutschenthal, 12 March 1805 – Stellenbosch, Cape Colony, 22 July 1883) was a Protestant Rhenish Missionary active in Namaland, South West Africa.
In 1839 Hanh founded the Ebenezer United Reformed Church on the banks of the Olifants river, the site of a Khoikhoi settlement.
Hahn built a church, two homes and barns, a windmill, and a water pump, and cultivated lay gardens and fields.
Because Hahn realized missionary work could only proceed in cohesive communities, he continued trying to convert the nomadic Khoikhoi into farmers.
Hahn cultivated fields around Kubis and Oas on the Orange River banks with the help of the San people.