The American Society of Hematology (ASH) is a professional organization representing hematologists, founded in 1958.

Today, ASH has more than 17,000 members,[4] many of whom have made major advancements in understanding and treating blood diseases.

Held each year in December, the annual meeting brings together hematologists from around the world to discuss hematology.

Plenary symposia and named lectures on specialized areas of hematology are also presented throughout the meeting program.

[citation needed] ASH receives financial support from, and collaborates with, a number of pharmaceutical companies.