Croatia is due to its specific geographic position and its characteristic ecological, climatic and geomorphological opportunities for biodiversity, one of the richest countries in Europe. Over the last few decades, intensive agricultural production is expanding, resulting, among other things, in reducing biodiversity. Traditional weed species are particularly vulnerable because they grow mainly on agricultural surfaces. One of the aims of this paper was to provide an overview of the weed habitats in Croatia according to the latest research and related weed species. Weed vegetation falls under anthropogenic or synantropic vegetation and beside native domestic species, it contains many exotic species, accidentally or intentionally introduced. Based on the used literature it was established that in Croatia two classes of weed vegetation (Papaveretea rhoeadis S. Brullo et al. 2001 and Digitario sanguinalis- Eragrostietea minoris Mucina, Lososová et Šilc in Mucina et al. 2016) and three orders, four alliances, and nine associations of weed vegetation are present. The number of weed communities is probably higher because weed vegetation is not fully explored in Croatia. There are numerous reasons for endangered habitats, with particular emphasis on excessive use of pesticides, invasive foreign species, excessive use of mineral fertilizers and other agrochemicals, various pollutants (air, water, soil), use of heavy agricultural mechanization, etc. Some positive shifts in Croatia are present, however, it is necessary to do more to preserve biodiversity. The most important thing is to reduce the use of pesticides (to prohibit the use of most hatrmfull ones), to prevent the spread of foreign invasive species and to reduce their harmful impact and to invest more resources in the development of organic agriculture.