Septum
- Alternaria
- Alveolar septum
- Amoeba
- Annelid
- Body cavity
- Interatrial septum
- Intermuscular septum (disambiguation)
- Interventricular septum
- Latin language
- Lingual septum
- Nasal septum
- Orbital septum
- Pulmonary alveolus
- Saccharomyces cerevisiae
- Scrotal septum
- Septum (cephalopods)
- Septum (coral)
- Septum glandis
- Septum of the penis
- Septum pellucidum
- Uterine septum
- Vaginal septum