Ermelo (/əməloʊ/) is the educational, industrial and commercial town of the 7,750 km2 Gert Sibande District Municipality in Mpumalanga province, Republic of South Africa.

[3]: 302  Modern Ermelo was founded by Dutch Reformed Church Reverend Frans Lion Cachet (1835–1899).

[3]: 303  Cachet was an outspoken preacher, who had a strong interest in evangelism to Jews, his own family having Jewish heritage.

[3]: 303 Mixed farming such as maize, cattle, potatoes, beans, wool, pigs, sunflower seeds, nuts, sub-tropical fruits, lucerne and sorghum take place around the district.

[3]: 303 Ermelo falls under the Msukaligwa Local Municipality which is situated in the Gert Sibande District, of Mpumalanga.

The arms were registered with the Transvaal Provincial Administration in January 1957[7] and recorded at the Bureau of Heraldry as part of a municipal flag in 1967.

[8] The arms were : Per pale, dexter Or, a mining headgear Sable; sinister Vert, a sheep-shear and spade in saltire, handles upwards, Argent; on a chief Gules a phoenix on a nest enflamed, Or.

[8] The arms were: Per fess Or and Vert, charged over the partition line with five lozenges conjoined, per fess Sable and Argent; in chief a phoenix Sable issuant from flames Gules and in base sheep shears and a spade in saltire, blades to base, Argent.

[3] The town also lies on the railway line that connects the coalfields with the Port of Richards Bay on the Indian Ocean.