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| colspan="2" |
|- class="hiddenStructure"
|Latin
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|- class="hiddenStructure"
|[[List of subjects in Gray's Anatomy:3#Gray.27s_page_.23|Gray's]]
|colspan="2"|[subject #3 ]
|- class="hiddenStructure"
|System
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|- class="hiddenStructure"
|Precursor
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|- class="hiddenStructure"
|MeSH
|colspan="2"|[A05.360.490.690.700]
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|Dorlands/Elsevier
|colspan="2"|[/]
|}
An oogonium (plural oogonia) is a female gametogonium. They are formed in large numbers by mitosis early in fetal life from primordial germ cells. Once in the ovary, they divide by mitosis into two primary oocytes; it is important to note that this process is complete before birth, in contrast to spermatogenesis.
Oogonia are also the female reproductive structures in certain thallophytes, and are usually rounded cells or sacs containing one or more oospheres.
