The International Securities Lending Association

The ISLA is a trade association established in 1989 to represent the common interests of participants in the securities lending industry.
http://www.isla.co.uk/

Australian Securities Lending Association

ASLA, the Australian Securities Lending Association, was formed in August 1991 in response to a perceived need amongst industry participants for unified representation in regulatory and other issues relevant to its members.
http://www.asla.com.au/

The Risk Management Association

RMA's Committee on Securities Lending was formed in 1983. The objective of the committee is to promote sound securities lending practices within its members and the industry.
http://www.rmahq.org/RMA/SecuritiesLending