Einsteinium(III) bromide, often represented by the chemical formula EsBr3, is a hypothetical chemical compound composed of einsteinium (Es) cations and bromine (Br) anions. Einsteinium is a highly radioactive synthetic element with the atomic number 99, and it is challenging to work with due to its short half-life and scarcity.

Einsteinium(III) bromide, if it were to exist, would be expected to have properties consistent with other lanthanide and actinide compounds. Compounds of elements like einsteinium are primarily studied for fundamental research purposes, and their chemical behaviors are of interest in understanding the behavior of heavy radioactive elements.

However, due to the extreme challenges associated with working with einsteinium, its limited availability, and its short half-life, practical studies on compounds like einsteinium(III) bromide are rare. Research related to einsteinium is mainly focused on advancing our understanding of the behavior of heavy elements and their atomic properties.