The measure's sponsor, Republican state Sen. Renee Unterman of Buford, described her bill as a "positive" response to videos released this summer by abortion opponents showing Planned Parenthood officials discussing procedures for obtaining tissue from aborted fetuses for research.
A Texas grand jury later cleared the organization of wrongdoing.
Deal signed the bill in a private ceremony and didn't issue a public statement.
Georgia now joins at least 10 other states that specifically dedicate funding to anti-abortion efforts, according to the Guttmacher Institute, a research organization that supports legal access to abortion. Elizabeth Nash, a policy analyst at the organization, said the practice began in some states decades ago.