Abishai was the father of (i.e., "desirous of") a gift, the eldest son of Zeruiah, David's sister. He was the brother of Joab and Asahel (2 Sam. 2:18; 1 Chr. 2:16). Abishai was the only one who accompanied David when he went to the camp of Saul and took the spear and the cruse of water from Saul's bolster (1 Sam. 26:5–12).

Abishai are a fictional species of baatezu (devils) in the Dungeons & Dragons role-playing game. The abishai are humanoid creatures that resemble gargoyles or humanoid dragons. There are five kinds, easily distinguishable by color (black, blue, green, red, and white).