IN AN EMAIL QUOTED IN THIS POST, Stefan Sharkansky said that he couldn’t remember a newspaper making an editorial page correction. Neither could I. (And neither could Terry Teachout). But Linda Seebach put the question to an editorial-page listserv and many reported that they do make corrections (though sometimes in the “corrections box” rather than on the editorial page). Stefan has more comments on this subject here.
UPDATE: This dialogue between Donald Luskin and Dan Okrent is somewhat related.