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A comment on Ask HN: Who uses ontologies in practice and for what use case?.
[0] https://ec.europa.eu/isa2/solutions_en
[1] https://ec.europa.eu/isa2/solutions/core-vocabularies_en
(but maybe you meant this question in a more general sense, not specific examples)
[0] https://ec.europa.eu/isa2/solutions_en
[1] https://ec.europa.eu/isa2/solutions/core-vocabularies_en
(but maybe you meant this question in a more general sense, not specific examples)