Apian or Apianus may refer to:
- 19139 Apian, asteroid named after Peter Apian
- Apianus (crater), (26° 9' S and 7° 9' E) on the Moon named after Peter Apian
People:
- Apian or Aphian, Catholic and Eastern Orthodox saint
- Peter Apian or Petrus Apianus, as well as Peter Bienewitz or Bennewitz, (1495-1552), German humanist
- Georg Apian or Georg Apianus as well as Georg Bienewitz or Bennewitz, German 16th century printer and publisher (brother of Peter Apian)
- Philipp Apian, also Philipp Apianus, (1531-1589), German mathematician, physician and cartographer (son of Peter, brother of Timotheus Apian)
- Timotheus Apian, (?-1562), German land surveyor (son of Peter, brother of Philipp Apian)
- Paul Otto Apian-Bennewitz, (1847-1892), organist and teacher, founder of the Museum of Musical Instruments in Markneukirchen
Other:
- Apian-Gymnasium Ingolstadt, secondary school in Ingolstadt, Germany, named after Peter and Philipp Apian
- Peter-Apian-Mittelschule Leisnig, middle school in Leisnig, Germany, named after Peter Apian
- Apian-Bennewitz-Straße, street in Markneukirchen, Germany, named after Paul Otto Apian-Bennewitz
- Peter-Apian-Platz, town square in Leisnig, Germany, named after Peter Apian
- Apianborn, spring in Leisnig, Germany, named after Peter Apian
- Apianstraße, streets in Munich, in Unterföhring, in Rosenheim, in Ingolstadt, in Landshut and in Ittelhofen, Germany