Classics:
* The Little Mermaid (1989) - The Disney classic with Ariel the mermaid.
* Splash (1984) - A charming romantic comedy about a mermaid who falls in love with a human.
* Legend (1985) - A fantasy film with a beautiful mermaid and a dark, mythical world.
* Pirates of the Caribbean: Dead Man's Chest (2006) - Features the mermaid, Tia Dalma, who holds magical powers.
* The Mermaid (2016) - A Chinese fantasy film about a mermaid who falls in love with a human.
Modern:
* Aquamarine (2006) - A teen comedy about two girls who find a mermaid.
* The Shape of Water (2017) - A romantic fantasy film with a "fish-man" character.
* The Little Mermaid (2023) - The live-action remake of the Disney classic.
* Aquaman (2018) - The DC Comics superhero film set in Atlantis with numerous underwater creatures.
* The Water Horse: Legend of the Deep (2007) - A family-friendly film about a mythical creature that's part horse, part fish.
Other notable mentions:
* The Thirteenth Year (1999) - A teenage boy discovers he's a merman.
* Deep Blue Sea (1999) - A horror film featuring genetically enhanced sharks with some mermaid-like traits.
* The Siren (2018) - A thriller film about a siren who lures sailors to their deaths.
* The Mermaid (2016) - A Chinese fantasy film about a mermaid who falls in love with a human.
* Ponyo (2008) - A Japanese animated film by Studio Ghibli about a goldfish princess who wants to be human.
Animated:
* The Little Mermaid (TV series, 1992-1994) - A spin-off of the Disney movie.
* H2O: Just Add Water (2006-2010) - A popular Australian teen series about three girls who become mermaids.
* Mako Mermaids (2013-2016) - A spin-off of H2O: Just Add Water.
* The Legend of Korra (2012-2014) - The Avatar universe features a merman named Unalaq.
* SpongeBob SquarePants (1999-present) - This beloved cartoon features the occasional appearance of mermaids.
Live-Action:
* Siren (2018-2020) - A supernatural thriller series about a mermaid living among humans.
* Once Upon a Time (2011-2018) - This fantasy series features mermaids, mermen, and various other mythical creatures.
* The Secret Circle (2011-2012) - A teen drama about a group of witches who are also part-mermaid.
* The OA (2016-2019) - This supernatural drama features a character who has the ability to shapeshift into a mermaid.
* Penny Dreadful (2014-2016) - This horror series features mermaids in several episodes.
This is just a selection of movies and TV shows featuring mermaids and mermen. Many other shows and films feature these creatures, even if they are not the central focus. Keep in mind that this list may not be exhaustive and there are likely other movies and shows you could enjoy.