"The Sushruta Samhita (सुश्रुतसंहिता, IAST: Suśrutasaṃhitā, literally "Suśruta's Compendium") is an ancient Sanskrit text on medicine and surgery, and one of the most important such treatises on this subject to survive from the ancient world. The Compendium of Suśruta is one of the foundational texts of Ayurveda (Indian traditional medicine), alongside the Caraka-Saṃhitā, the Bheḷa-Saṃhitā, and the medical portions of the Bower Manuscript. It is one of the two foundational Hindu texts on medical profession that have survived from ancient India.
The Suśrutasaṃhitā is of great historical importance because it includes historically unique chapters describing surgical training, instruments and procedures which is still followed by modern science of surgery. One of the oldest Sushruta Samhita palm-leaf manuscripts is preserved at the Kaiser Library, Nepal."
(from Wikipedia)
English translation by Kaviraj Junja Lal Bhishagratna:
The Sushruta Samhita Vol. 1 (file size: about 11 MB)
The Sushruta Samhita Vol. 2 (file size: about 13 MB)
The Sushruta Samhita Vol. 3 (file size: about 10 MB)