Julius Caesar is a 1970 film adaptation of William Shakespeare's play of the same name, directed by Stuart Burge. It stars Charlton Heston as Mark Antony, Jason Robards as Brutus, Richard Johnson as Cassius, John Gielgud as Caesar, Robert Vaughn as Casca, Richard Chamberlain as Octavius, and Diana Rigg as Portia. It was an independent production of Commonwealth United Entertainment, filmed in England and Spain. It is the first film version of the play made in colour.
 The film was shot primarily at MGM-British Studios and Pinewood Studios in England. The battle sequences were filmed on-location in Manzanares el Real, Spain.
 Orson Welles was the first choice to portray Brutus, but was passed over for Jason Robards, who had considerable difficulties during production:  frequently missing rehearsals, refusing to appear on horseback, and holding up the proceedings due to illness.
 John Gielgud and Charlton Heston had both appeared in previous film adaptations of Shakespeare's play; Gielgud played Cassius in the 1953 film directed by Joseph L. Mankiewicz, and Heston also played Mark Antony in a low-budget 1950 version. He would do so yet again, in a 1972 film version of Shakespeare's Antony and Cleopatra, which Heston also directed.
 Peter Eyre is credited as playing Cinna the poet, but his role was cut from the final film. Max Adrian was cast in a featured role, but dropped out before filming.
 Julius Caesar had its world premiere in Tokyo on 20 February 1970 and was released in the UK on 4 June 1970. The film failed at the box office.[citation needed]
 The reviews for this version upon its theatrical release were mostly negative, with Robards especially being criticized for his wooden performance as Brutus.
 Howard Thompson wrote in his review:  "Ye gods! Must I endure all this?" understandably bellows Cassius (Richard Johnson) in the last lap of the third filming of William Shakespeare's Julius Caesar, which opened yesterday at the Kips Bay Theater. Made in England and Spain and in color, with a perfectly viable cast headed by Jason Robards and Charlton Heston, the new picture is generally as flat and juiceless as a dead haddock. In this third go-round, Willie and Julius, both, really get the business. It's Shakespeare all right, at least in dialogue. Dramaturgically, the blueprint adheres to the Hollywood version back in 1953. That solid, intelligent treatment may have lacked majesty but it did have two fire-and-ice performances by John Gielgud as Cassius and Marlon Brando as Mark Antony. And the tormented soul of the real hero, Brutus (James Mason), was sufficiently and touchingly bared. Then there was an even earlier Julius Caesar from Chicago, of all places, with a newcomer named Charlton Heston as Antony, which he repeats here. The movie did have a raw, shoestring vigor and a bit more. The new movie moves sluggishly, as directed by Stuart Burge. As the center of the whole thing, Robards is incredibly dull and wooden as Brutus, the "noblest Roman of them all." Heston supplies laconic bite and delivers a good, ferocious funeral oration. For all his professionalism, Gielgud's Caesar is just an old shrewdie who yields to his ego. In Sir John's former Cassius slot, Johnson looks anything but "lean and hungry," with a bearded sneer, contrasting Robert Vaughn's bland, eye-rolling Casca. However, Diana Rigg and Richard Chamberlain, as Portia and Octavius Caesar, are briefly excellent in their quicksliver precision and feeling. But it's hopeless. Now Julius Caesar looks left out all night. 
Critic Roger Ebert gives it only one star. In his review, he wrote:  There's hardly any way to describe how Jason Robards brings Julius Caesar to its knees, but let me try. It's a neat trick. He stares vacantly into the camera and recites Shakespeare's words as if he'd memorized them seconds before, or maybe was reading from idiot cards. Each word has the same emphasis as the last, and they march out of the screen at us without regard for phrases, sentences or emotional content. We begin to suspect, along toward Robards' big speech over Caesar's body, that Robards' mind has been captured by a computer from another planet and that the movie is an alien plot to drain the soul from mighty Shakespeare.
Robards would be enough, all by himself, to capsize the movie, but there's more. The actors race about on sets so flimsy we half expect them to collapse and sweep the entire Senate away with Caesar. When the crowds gather for Mark Antony's funeral oration, they group themselves like refugees from a particularly orderly Renaissance painting. When we get close-ups of the conspirators, they're arranged like mannequins in a department store window, and so rigid is the staging that sometimes they actually have to talk over their shoulders to each other. And then there's the matter of the walla. In big crowd scenes, sound departments always put in a lot of walla. Crudely defined, walla is the mix of indistinguishable noises a crowd makes when it talks all at once: Walla, walla, walla. Now walla isn't expensive - mere cents per wal - but in Julius Caesar something very weird has happened to the walla. It sounds as if it were composed on a synthetic electronic device of some sort; it doesn't sound human. So there's poor Robards trying to remember his lines, and all this synthetic walla curling around him, and then Charlton Heston leaps in with his Mark Antony speech. Heston does a fine job. Indeed, several performances are good; especially Robert Vaughn's as a slippery Casca. But just when Heston gets into high gear, we cut away to a long shot of the crowd and lose all the personal emotion in Heston's face. Charlton Heston later expressed dissatisfaction with the film, which had been a passion project, claiming it had a poor director, an unsuitable cameraman, and the wrong actor as Brutus. He called Jason Robards’ performance “the worst performance by a really good actor.”
 The film was released on DVD on 11 May 2004 initially and then 1 February 2005, 25 July 2006, and 19 February 2013 afterwards. Upon its 2013 Blu-ray disc release, it met with a more positive review from the website DVD Talk, although Jason Robards' performance was still soundly panned. Its previous DVD release, which was pan-and-scanned rather than letterboxed, had been harshly criticized, and several other DVD reviewers also disparaged the film.