Sergeants 3 is a 1962 American comedy/Western film directed by John Sturges and starring Rat Pack icons Frank Sinatra, Dean Martin, Sammy Davis Jr., Peter Lawford and Joey Bishop. It was the last film to feature all five members of the Rat Pack, as Sinatra would no longer speak to or work with Lawford following the abrupt cancellation in March 1962 of a visit by Lawford's brother-in-law, President John F. Kennedy, to Sinatra's Palm Springs house (Kennedy opted to stay at Bing Crosby's estate instead).

The film is a remake of Gunga Din (1939), with the setting moved from India to the American West.