The longtime Republican and Hollywood legend is expected to walk through the convention floor for a rundown of tonight's events, CNN reported.
More from GlobalPost: Complete GOP convention coverage
Eastwood endorsed Mitt Romney for president earlier this month during a fundraiser in Sun Valley, Idaho.
In February, Eastwood had told Fox News that he wasn't supporting any politicians, although some people saw his "Halftime in America" Super Bowl ad for Chrysler as a nod toward President Barack Obama.
Romney is expected to accept the Republican Party nomination for president Thursday night.