A person who actually saw an accident, crime, or other incident and can testify about what they witnessed.
警察は近所の目撃者から事情を聴いている。
The police are questioning nearby witnesses.
目撃者の証言によれば、青い車が交差点を飛び出したそうだ。
According to a witness's testimony, a blue car ran into the intersection.
事故現場には数人の目撃者がいたため、映像と証言を照合した。
There were several witnesses at the accident scene, so we compared footage with their statements.