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Hemocyanin is a copper-containing protein found in the blood of some mollusks and arthropods, which transports oxygen in a manner similar to hemoglobin.

Myoglobin is a protein found in muscle cells that stores oxygen and releases it when the muscle is active and in need of energy.

Cytochrome c oxidase is an enzyme found in the mitochondria that transfers electrons to oxygen, converting it to water during the process of oxidative phosphorylation.

Hemerythrin is an oxygen-carrying protein found in the marine invertebrates, like some worms and brachiopods, and operates similarly to hemoglobin, albeit less efficiently.

Hemoglobin is a protein found in red blood cells that binds oxygen in the lungs and transports it to tissues where the oxygen is released.

Neuroglobin is a protein that is expressed in the brain and retina which reversibly binds oxygen, and may protect neurons from damage through oxidative stress.

Erythrocruorin is a giant extracellular hemoglobin found in some annelids, including earthworms, which transports oxygen through their circulatory system.

Chlorocruorin is a greenish oxygen-binding protein found in some species of annelids, notably in the family Serpulidae, which can also function for oxygen transportation.

Globins are a family of proteins, which include hemoglobin and myoglobin among others, that are involved in binding and delivering oxygen to cells.