Keishi Kameyama

{{Short description|Japanese businessman}}

{{Use dmy dates|date=March 2020}}

{{Infobox person

| name = Keishi Kameyama

| birth_name =

| birth_date = {{birth based on age as of date |56|2017|08|23}}

| birth_place =

| death_date =

| death_place =

| death_cause =

| nationality = Japanese

| education =

| alma mater =

| occupation = Businessman

| title = Founder and Chairman, DMM.com

| term =

| predecessor =

| successor =

| known for =

| boards =

| spouse = Married

| children = 2

| parents =

| relations =

| website =

}}

{{Nihongo|Keishi Kameyama|亀山 敬司|Kameyama Keishi|born 1960/61}} is a Japanese billionaire businessman, chairman of the internet company DMM.com, who made his initial fortune in pornography.

In 1999, Kameyama founded DMM.com,{{cite web|url=http://www.theworldfolio.com/news/dmmcom-leads-japan-incs-innovation-drive/4149/|title=DMM.com leads Japan Inc.'s innovation drive|first=The|last=Worldfolio|date=|website=theworldfolio.com|accessdate=4 September 2017}} and is its chairman.{{cite news|url=https://www.bbc.co.uk/news/business-31689268|title=Rebooting innovation in Japan|first=Mariko|last=Oi|work=BBC News |date=2 March 2015|publisher=|accessdate=4 September 2017}}

DMM started in pornography and "adult entertainment", and has "grown into a vast collection of enterprises".{{cite news|url=https://www.bloomberg.com/news/articles/2017-08-23/billionaire-porn-king-reinvents-himself-as-japan-s-startup-guru|title=How a Billionaire Porn Film-Maker Transformed His Business|author=|newspaper=Bloomberg |date=23 August 2017|publisher=|accessdate=4 September 2017|via=www.bloomberg.com}}

In August 2017, Kameyama had an estimated net worth of US$3.5 billion.

Kameyama is married, with two children.