What unseen waitress had phone conversations with Barney Fife as his second girlfriend?

The unseen waitress who had telephone conversations with Barney Fife as his second girlfriend was Juanita Beasley.

Juanita worked at the Bluebird Diner, also identified in the series as the Junction Cafe, and Barney spoke with her by telephone. Viewers never saw her on screen, so her relationship with Barney was established entirely through his conversations and references to her.

Juanita was mentioned in ten episodes and was first brought up in the first-season episode “Andy Forecloses.” She is part of the show’s recurring off-screen world, much like Sarah, the telephone operator who occasionally speaks with Mayberry residents but is rarely seen.

Thelma Lou is the most important name associated with Barney’s romantic life, but she was not his only girlfriend. Barney also dated women such as Miss Rosemary and Hilda May. That broader dating history can make Juanita easy to confuse with another unseen or briefly mentioned character.