What was Harrison Ford's first credited film?

His first credited film was in 1967 called A Time for Killing, a Western set during the Civil War. Ford, who plays Lieutenant Shaffer, stars alongside acclaimed actors of that time period including Inger Stevens, Glenn Ford, and Paul Petersen. The film, based on the 1961 novel The Southern Blade by Nelson Wolford and Shirley Wolford, was directed by Phil Karlson and produced by Harry Joe Brown. A Time for Killing went on to become an integral piece of Harrison Ford’s history and paved the way for his career to skyrocket. Harrison Ford's movies have made over $5 billion in North America and over $9 billion globally. Ford became well-known all across the globe for his lead part as Han Solo in the epic space opera movie Star Wars: Episode IV - A New Hope, and he returned to play the character in four sequels over the course of the following 42 years.

Source: Movie Web