Movies:
* The Lion King II: Simba's Pride (1998) - Young Nala
* The Princess and the Frog (2009) - Mama Odie (singing voice)
* The Princess and the Frog (2009) - Eudora (singing voice)
* The Lion King II: Simba's Pride (1998) - Vitani
* Toy Story 2 (1999) - Jessie (singing voice)
* Toy Story 3 (2010) - Jessie (singing voice)
* Toy Story 4 (2019) - Jessie (singing voice)
* The Little Mermaid: Ariel's Beginning (2008) - Alana (singing voice)
* The Emperor's New Groove (2000) - Yzma (singing voice)
* The Emperor's New Groove 2: Kronk's New Groove (2005) - Yzma (singing voice)
* Lilo & Stitch (2002) - Nani (singing voice)
* Lilo & Stitch 2: Stitch Has a Glitch (2005) - Nani (singing voice)
* Mulan (1998) - Fa Li (singing voice)
* Mulan II (2004) - Fa Li (singing voice)
* Brother Bear (2003) - Tanana (singing voice)
* Brother Bear 2 (2006) - Tanana (singing voice)
* Tarzan (1999) - Kala (singing voice)
* Tarzan II (2005) - Kala (singing voice)
* Pocahontas (1995) - Meeko (singing voice)
* Pocahontas II: Journey to a New World (1998) - Meeko (singing voice)
* The Hunchback of Notre Dame (1996) - Esmeralda (singing voice)
* The Hunchback of Notre Dame II (2002) - Esmeralda (singing voice)
* Hercules (1997) - Megara (singing voice)
* Hercules: The Zeroes (1998) - Megara (singing voice)
* Atlantis: The Lost Empire (2001) - Kida (singing voice)
* Atlantis: Milo's Return (2003) - Kida (singing voice)
Television:
* The Simpsons (various characters)
* Family Guy (various characters)
* American Dad! (various characters)
* King of the Hill (various characters)
* Futurama (various characters)
* Avatar: The Last Airbender (various characters)
* The Legend of Korra (various characters)
* Adventure Time (various characters)
* Steven Universe (various characters)
* Star vs. the Forces of Evil (various characters)
* The Owl House (various characters)
* Amphibia (various characters)
* Big Mouth (various characters)
* BoJack Horseman (various characters)
* Rick and Morty (various characters)
* Gravity Falls (various characters)
* Regular Show (various characters)
* The Amazing World of Gumball (various characters)
* Teen Titans (various characters)
* Teen Titans Go! (various characters)
* Young Justice (various characters)
* Justice League (various characters)
* Justice League Unlimited (various characters)
* Batman: The Brave and the Bold (various characters)
* Batman Beyond (various characters)
* The Batman (various characters)
* Static Shock (various characters)
* Justice League Action (various characters)
* Harley Quinn (various characters)
* My Little Pony: Friendship is Magic (various characters)
* My Little Pony: Equestria Girls (various characters)
* She-Ra and the Princesses of Power (various characters)
* Trollhunters: Tales of Arcadia (various characters)
* 3Below: Tales of Arcadia (various characters)
* Wizards: Tales of Arcadia (various characters)
* Voltron: Legendary Defender (various characters)
* The Dragon Prince (various characters)
* Kipo and the Age of Wonderbeasts (various characters)
* Hilda (various characters)
* The Midnight Gospel (various characters)
* Arcane (various characters)
This list is not exhaustive, as Julie Mannix has an extensive voice-acting career spanning decades. You can find more information about her work on IMDb and other online resources.