Sigi is a mythical hero and a son of Odin in Norse legends.

Sigi or SIGI may also refer to:

Places

• Sigi River, Tanzania
• Sigi Regency, Sulawesi, Indonesia

People

• Sigi Schmid (1953–2018), German-American soccer coach
• Sigi Ziering (1928-2000), German-born American business executive, playwright and philanthropist
• Marjorie Lynette Sigley (1928–1997), British artist, writer, theatre director and television producer

Other

• Space Integrated GPS/INS
• Social Institutions and Gender Index
• Sigi (or Sigui), a festival of the Dogon people of Mali; see Dogon religion