Dětmarovice consists of two municipal parts (in brackets population according to the 2021 census):[2] The name is patronymic in origin derived from German personal name Dietmar.

It was first mentioned in Latin form Dithmari villa (1305), later as Dytmarsdorff (1392), Dietmarsdorf (1430), Dieczmarowicz[e] (1438, 1447), Dieczmiorowice (1652), Dittmersdorf/Dieczmorowitz (1736), Dittmansdorf/Dietmarowicze (1804), Dittmannsdorf/Dětmarovice/Dziećmarowice (1900).

Officially the village was first mentioned in a Latin document of Diocese of Wrocław called Liber fundationis episcopatus Vratislaviensis from 1305.

[5] Politically the village belonged initially to the Duchy of Teschen, formed in 1290 in the process of feudal fragmentation of Poland and was ruled by a local branch of Piast dynasty.

In 1573 it was sold as one of a dozen villages and the town of Freistadt and formed a state country split from the Duchy of Teschen.

Following the Munich Agreement, in October 1938 together with the Trans-Olza region it was annexed by Poland, administratively organised in Frysztat County of Silesian Voivodeship.

[8] The municipality was then annexed by Nazi Germany at the beginning of World War II.

Historical landmarks include the Něbroj's chapel from around 1860 and the Catholic Church of Saint Mary Magdalene, built in Neo-Romanesque style in 1869–1870.