Seungju (승주), alternatively spelled as Seungjoo, may refer to:
- People
- Seungjoo (currently known as Jooah) of Free In Sass
- Seungjoo of SAY MY NAME, former My Teenage Girl contestant
- Seungjoo, former member of B.Dolls
- Shin Seungju, former pre-debut member of JWiiver