Lennart Nilsson was a Swedish photographer and scientist. He was noted for his photographs of human embryos and other medical subjects once considered unphotographable, and more generally for his extreme macro photography. He was also considered to be among Sweden’s first modern photojournalists.

Lennart Nilsson var en svensk fotograf, mest känd för sin banbrytande titthålsfotografi inom medicin. Hans mest kända alster är filmen Sagan om livet och boken Ett barn blir till.