Look up seijo in Wiktionary, the free dictionary.
Seijo is a name; notable people called Seijo include:
- Seijo Inagawa (1914–2007), Japanese yakuza boss, founder of the Inagawa-kai
- Bibiana Campos Seijo, editor, publisher, and media executive
- Francisco Zayas Seijo (born 1951), former member of the Puerto Rico House of Representatives
- Jorge Seijo (born 1942), radio and television personality
- Luisa Seijo (born 1950), Puerto Rican academic, activist, and social worker