Fortis may refer to:
In people:
- Alberto Fortis (1741–1803), Venetian writer, naturalist and cartographer
- Alberto Fortis (musician) (born 1955), Italian singer and songwriter
- Alessandro Fortis, Italian politician and prime minister
- Louis Fortis, American politician
- Rami Fortis, Israeli rock musician
In business:
- Fortis (finance), a defunct banking, financial services and insurance company, based in Belgium and The Netherlands or their successors:
- Ageas, formed from the insurance operations of Fortis
- ASR Nederland, formed from the Dutch insurance operations of Fortis
- BNP Paribas Fortis, formed from the Belgian banking operations of Fortis, now owned by BNP Paribas
- ABN Amro, formed from the Netherlands banking operations of Fortis, now owned by the Dutch government
- Fortis Healthcare Limited, a chain of hospitals based in India
- Fortis Inc., a Canadian utility holding company
- Fortis Uhren AG, a Swiss watch company
Other:
- Fortis (linguistics), a group of consonants that are produced with greater energy
- Fortis Healthcare, a chain of hospitals in India
- Galant Fortis, also known as the Mitsubishi Lancer