"The Best of Both Worlds" is the 26th episode of the third season and the first episode of the fourth season of the American science fiction television series Star Trek: The Next Generation. It comprises the 74th and 75th episodes of the series overall. The first part was originally aired on June 18, 1990, and the second on September 24, 1990 in broadcast syndication television.

Set in the 24th century, the series follows the adventures of the Starfleet crew of the Federation starship Enterprise-D. In this two part episode, the Enterprise must battle the Borg who are intent on conquering Earth, with a captured and assimilated Captain Picard as their emissary. Part 1 was the finale to season three, while Part 2 was the premiere of season four. It is considered one of the most popular Star Trek episodes.In April 2013, "The Best of Both Worlds" was re-released edited together as a single feature film, released on Blu-ray disc and shown as a one-night only event in movie theaters.