- observer: an expert who observes and comments on something
- a writer who reports and analyzes events of the day
- The postglossators or commentators formed a European legal school which arose in France in the fourteenth century.
- Commentator (foaled March 27, 2001), is an American Thoroughbred race horse by the stallion Distorted Humor, sire of 2003 Kentucky Derby winner Funny Cide. Like Funny Cide, Commentator is a New York bred as well as a gelding. Distorted Humor also sired the sensational Hystericalady.
- Abū 'l-Walīd Muḥammad ibn Aḥmad ibn Rushd (أبو الوليد محمد بن احمد بن رشد), better known just as Ibn Rushd (ابن رشد), and in European literature as Averroes (1126 – December 10, 1198), was an Andalusian Muslim polymath; a master of Aristotelian philosophy, Islamic philosophy, Islamic theology, ...
- (The Commentators) The Commentators was a one-off name used for the song, "N-N-Nineteen Not Out", a 1985 UK hit single recorded by the impressionist Rory Bremner as a parody of Paul Hardcastle's number one hit, "19". ...
- (Commentators) Aaron Jacobs, Sara Fielding, Yaminocho Tang
- An organisation invited to comment on a technology appraisal. Commentators can comment on the evidence and other documents but are not asked to submit evidence. ...
- A person who leaves remarks regarding a blog entry.
- A broadcaster who is a specialist in a specific area, e.g. cricket or politics, who describes events or games as they are happening or who comments on recent events.
- A voice (the person speaking may be either seen or unseen) commenting on the action of a film. A commentator, unlike a narrator, provides supposedly unbiased information, maintaining apparent perspective and distance from what occurs on the screen.
- Organisations that engage in the appraisal process but that are not asked to prepare a submission dossier, and that receive the Final Appraisal Determination (FAD) for information only, without right of appeal. ...
- The person who is describing a garment that a model is wearing at a runway show.
- (Yeshiva College and Sy Syms School of Business' student newspaper)
- sb who speaks about a sports event as it is happening
- The person who gives the commentary at a show.
- the person who introduces the mass, readings, and announcements.