In human anatomy, the hilum ( /ˈhaɪləm/; pl.: hila), sometimes formerly called a hilus ( /ˈhaɪləs/; pl.: hili), is a depression or fissure where structures such as blood vessels and nerves enter an organ. Examples include:

• Hilum of kidney, admits the renal artery, vein, ureter, and nerves
• Splenic hilum, on the surface of the spleen, admits the splenic artery, vein, lymph vessels, and nerves
• Hilum of lung, a triangular depression where the structures which form the root of the lung enter and leave the viscus
• Hilum of lymph node, the portion of a lymph node where the efferent vessels exit
• Hilus of dentate gyrus, part of hippocampus that contains the mossy cells.

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