The LEGO Disney Ariel subtheme includes sets centered around Disney's "The Little Mermaid" franchise, focusing on the character Ariel and her underwater adventures. Active from 2014 to 2023, notable sets in this subtheme include "41050 Ariel's Amazing Treasures" (2014), 41145 Ariel and the Magical Spell (2017), and 43207 Ariel's Underwater Palace (2022). These sets often feature iconic scenes and characters from the films, such as Ariel, Flounder, and Ursula, along with detailed builds of underwater locations and palaces.
LEGO Disney was is a rebranded theme from the Disney Princess line in 2017 and licensed from the Walt Disney Company. Sets in the theme use standard System LEGO although most of the Disney Princess sets use minifigures like the Friends mini-dolls. These sets are mostly designed for girls aged 6 to 12.