The main organs of the excretory system are the

The answer is kidneys, lungs, and skin.

Beside kidneys, lungs, and skin, the excretory organs are liver, large intestine, urinary bladder, gallbladder, urethra, and ureter.
Kidneys are involved in the excretory system by filtering wastes which are excreted as urine. The lungs excrete carbon dioxide from the organism. Skin performs excretion through the sweat glands which produce sweat. Through sweat salt, water, oils are excreted out the organism.