He wrote: "While child sexual abuse occurs in every segment of society, the context of the abuse, the response by the institution and community, and other factors differ to some degree.
"In the past few years, there have been numerous reports of troubling incidents within the UK Jewish community; more specifically, within the Charedi community there."
An IICSA spokeswoman said that in addition to the investigations into the Catholic and Anglican churches, "we will also be conducting research into child sexual abuse in other faith communities, which may or may not lead to further inquiries. If decisions are made to investigate other faith communities, we will make an announcement at that time".
Mr Waks, who set up global anti-abuse group Kol v'Oz, noted that Chief Rabbi Ephraim Mirvis, as well as organisations including Migdal Emunah, Shema Koli, Reshet and the Board of Deputies had backed the fight against child sex abuse in the community.
Former teacher Todros Grynhaus, the son of a rabbi, was last year convicted of sexually abusing two children. He was initially referred for therapy and not reported to police.
In 2013, Menachem Mendel Levy was jailed for sexually abusing a teenage girl, who was ostracised by her community after reporting the crime.
A Channel Four documentary, also in 2013, showed strictly Orthodox leaders advising victims to let their abusers be dealt with by the community, rather than by the police.
