Crowe Horwath confirmed its status as a "Corresponding Member" in Iran in the April 2010 issue of the International Accounting Bulletin.
Crowe Horwath lists partner firms in Iran on its company website. ("Our Locations," Company website)
"RSM, a UK-based firm, and Crowe Horwath of the US have joined Grant Thornton, one of the second-tier international accountancy firms, in leaving Iran after coming under US political pressure... RSM said it would cease working with Dayarayan Auditing & Financial Services, while Crowe Horwath said it would cut ties with Hoshiyar/Behmand & Co." (Financial Times, "Three accounting firms pull out of Iran," 4/26/2013)
"no current plans to bring on a member firm in that [Iranian] jurisdiction."