Yes.

Screenplays are written in 12-point Courier, or a slight variation (Courier New or Courier Final Draft, for instance). This is because Courier is a fixed-pitch font, meaning each character or space is exactly the same width. Since standard screenplay format is designed so that one page approximately equals one minute of screen time, consistant character spacing is important.

Scriptwriting software will default to Courier 12.

If you are an avid script reader, you may come across scripts written in other fonts. Most sold-in-bookstores versions of scripts are this way, and some top-tier screenwriters write in other fonts. For example, many Coen Brothers drafts commonly found online are not in Courier, but as A-list auteurs who write, direct, produce, and edit their own work, they are beholden to fewer people and have more leeway. In this instance, do not follow their example.