Crawley will assume portfolio management responsibilities "later in the year, subject to the necessary regulatory approvals," the investment manager said.
In this newly created role, Crawley will be based in Hong Kong and report to Andrew Swan, head of Asian fundamental equity.
“The new role builds on the developments in our investment process we have introduced to better deliver performance to our clients. We look forward to Oisin (Crawley) adding his investment insights and skills to our platform and Asian equity franchise," Swan said.
Crawley joins from TT International where he was a portfolio manager over the last eight years.
Prior to TT International Investment Management, he worked as an equity research analyst at Morgan Stanley in London for six years. He has also worked in Tokyo as an industry researcher for the Tokyo Electric Power Company.
As of September-end, BlackRock managed assets worth $4.096trn ((£2.5trn).