IACS consists of 13 member societies, details of which are listed below. Chairmanship of IACS is on a rotational basis with each member society taking a turn.
The current chairmanship is as follows:

Chairman

Chairman of Council	Mr. T. Boardley	LR
Vice-Chairman	Mr. R. Cazzulo	RINA
Vice-Chairman (immediate past-Chairman)	Mr. P. Shikhov	RS

Members

Class	E-mail	Website (for more specific details)
ABS	abs-worldhq@eagle.org	http://www.eagle.org
BV	veristarinfo@bureauveritas.com	http://www.veristar.com
CCS	ccs@ccs.org.cn	http://www.ccs.org.cn
CRS	iacs@crs.hr	http://www.crs.hr
DNV	iacs@dnv.com	http://www.dnv.com
GL	headoffice@gl-group.com	http://www.gl-group.com
IRS	ho@irclass.org	http://www.irclass.org
KR	krsiacs@krs.co.kr	http://www.krs.co.kr
LR	Lloydsreg@lr.org	http://www.lr.org
NK	xad@classnk.or.jp	http://www.classnk.or.jp
PRS	iacs@prs.pl	http://www.prs.pl
RINA	info@rina.org	http://www.rina.org
RS	international.dept@rs-class.org	http://www.rs-class.org/