HRT announced on Wednesday that Vitantonio Liuzzi will complete the Spanish team's 2011 race driver lineup.
After being ousted by Force India, he will be Narain Karthikeyan's teammate, and will drive the new Hispania car later this week in Barcelona.
HRT also said on Wednesday that it will launch and debut the Cosworth-powered F111 on Friday.
"I have known Tonio for many years as he raced with me in lower categories," said team boss Colin Kolles, referring to the 29-year-old Italian.
In the same media statement, Liuzzi added: "I face a new challenge now and this excites me."