In which Star Trek film does the USS Enterprise-A first appear?

The USS Enterprise-A first appears in Star Trek IV: The Voyage Home.

The ship is revealed near the film’s end, after Kirk and his crew return from their 1986 time-travel mission. Their original Enterprise, NCC-1701, was destroyed in Star Trek III: The Search for Spock, so Starfleet assigns them a replacement vessel bearing the registry NCC-1701-A.

The Enterprise-A is a Constitution II-class starship and closely resembles the refitted Enterprise seen in the first three films. A common mix-up is placing its debut in Star Trek V: The Final Frontier, but that movie is the first film in which the Enterprise-A is used for a full adventure. The next Enterprise introduced on screen was the Enterprise-B in Star Trek Generations.