The second season of the American serial drama television series Lost commenced airing in the United States and Canada on September 21, 2005, and concluded on May 24, 2006.

In addition to the regular twenty-four episodes (with a run time around 42 minutes each), three clip-shows recapped previous events on the show.

The regular directors were Bender, producer Stephen Williams, camera operator Paul Edwards and Eric Laneuville.

On Rotten Tomatoes, the season has an approval rating of 100% with an average score of 9.2/10 based on 12 reviews.

The website's critical consensus reads, "This sophomore season goes smoothly down the hatch, deepening both the mysteries of the island and the depth of its castaways.

[16][17] The DVD set entered the sales chart at the number one position in its first week of release,[18] selling 500,000 copies in the first day.