Obadiah Williams

{{Use dmy dates|date=April 2022}}

Obadiah Williams was a 19th-century wealthy Irish merchant of Huguenot origin. About 1810 he built and resided in the Dartry House, an imposing two-storey mansion in the Dublin suburban area of the same name.Fagan, Jack, [http://www.irishtimes.com/newspaper/commercialproperty/2005/0518/2397197054CPMILLHILL.html "Period house on 3.9 acres in Dartry sold for €30m"], The Irish Times, May 18, 2005, URL retrieved November 19, 2006.

In 1891, he was a co-founder of the Penygraig Industrial Co-Operative Society.[http://webapps.rhondda-cynon-taf.gov.uk/heritagetrail/rhondda/penygraig/penygraig.htm Heritage Trail Sites] {{webarchive |url=https://web.archive.org/web/20070927091830/http://webapps.rhondda-cynon-taf.gov.uk/heritagetrail/rhondda/penygraig/penygraig.htm |date=September 27, 2007 }}, Rhondda Cynon Taf Library Service, URL retrieved November 19, 2006.