3rd-century BC mathematicians

Kātyāyana (कात्यायन) also spelled as Katyayana ( century BCE) was a Sanskrit grammarian, mathematician and Vedic priest who lived in ancient India.

Sudines (or Soudines) () () was a Babylonian sage. He is mentioned as one of the famous Chaldean mathematicians and astronomer-astrologers by later Roman writers like Strabo (Geographia 16:1–6).