Ajay Singh (1926–2017), Indian lichenologist.
IPNI Standard Form: Ajay Singh
- Ajay Singh. Lichens of India. Bulletin of the National Botanical Gardens -Lucknow- No. 93: 1–356. 1964 (reviewed by W. L. Culberson)
- Ajay Singh. 1971. Some unrecored and interesting pyrenocarpus lichens from Andaman Islands, India
- Ajay Singh (1926–2017) from Workshop Manual for Field Based Hand-on Training on Lichen Systematics. (2019)