Alec Guinness played Obi Wan in Episodes 4, 5, and 6. Ewan McGregor played Obi Wan in Episodes 1, 2, and 3.
Alec Guinness played Obi-Wan Kenobi in the Original Triology (A new hope, Empire strikes back, and Return of the Jedi).
In all three episodes of the new trilogy, Obi-Wan Kenobi was played by actor Ewan McGregor. I do agree, but Alec Guiness played Obi-Wan Kenobi in the last 3 episodes as Luke Skywalker's mentor.
Obi-Wan Kenobi
The first actor in The Phantom Menace was Ewan McGregor. The actor of Obi-Wan Kenobi in the 1970's films was Alec Guinness.
Alec Guinness played Obi Wan in Episodes 4, 5, and 6. Ewan McGregor played Obi Wan in Episodes 1, 2, and 3.
Obi-Wan Kenobi was played by Ewan McGregor.
If you're talking about the prequel films, Obi-Wan was played by Ewan McGregor
the old obi wan was played by Alec Guinness and the young was played by Ewan McGregor
Obi-Wan Kenobi
Alec Guiness played Obi-Wan Kenobi in Episodes IV-VI.
Alec Guinness played Obi-Wan Kenobi in the Original Triology (A new hope, Empire strikes back, and Return of the Jedi).
In all three episodes of the new trilogy, Obi-Wan Kenobi was played by actor Ewan McGregor. I do agree, but Alec Guiness played Obi-Wan Kenobi in the last 3 episodes as Luke Skywalker's mentor.
In the original trilogy, he was played by Alec Guinness. In the prequel trilogy, he was played by Ewan McGregor. In the Clone Wars microseries and the brand new CGI series, he is voiced by James Arnold Taylor.
Ewan McGregor, who also played Obi-Wan in Episodes 2 and 3
Ewan McGregor played Obi Wan Kenobi in Revenge of the Sith.
Harrison Ford never played Obi-Wan Kenobi. Alec Guinness did play Old Ben Kenobi.