Ko te Williams FW04 (i muri mai ko te Wolf<unk>Williams FW04) he motuka Formula Kotahi i whakamahia e Frank Williams Racing Cars i te waa 1975 me Wolf<unk>Williams Racing i te waa 1976. Ko te motuka he whanaketanga o te Williams FW a e rua i hangaia. Ahakoa ehara i te motokā tino angitu, ko te FW04 i mutu i te tuarua i te
Ko te 1975 German Grand Prix.