Upin & Ipin (Jawi: اوڤين دان ايڤين‎) is a Malaysian children's animated television series created by Burhanuddin Md Radzi and his wife, Ainon Ariff and is produced by Les' Copaque Production, based in Shah Alam, Selangor. The series made its premiere on TV9 for 11 seasons and on Astro Ceria, Astro Prima and TV2 from season 12 onwards. It also made its premiere in Indonesia on MNCTV (formerly TPI) and Trans TV. The series also released widely for online streaming on both Disney+ and Netflix.

The series follows Upin and Ipin, five-year-old twin brothers who were characterised by their abundance of energy, imagination and curiosity about the world. Both twins, who had lost their parents while they are still a baby, lived with their older sister, Ros and grandmother, whom they called Opah, at the fictional Kampung Durian Runtuh. Overarching themes include the focus on family, growing up, and Malaysian culture.

Originally a side project for the blockbuster animated film Geng: The Adventure Begins (2009), Upin & Ipin was introduced on TV9 on 14 September 2007 as a six episode Ramadan and Eid-ul-Fitr special, to teach children the significance of the Islamic holy month of Ramadan and Shawwal. A second season, also centered on Ramadan, aired in 2008. As of 2024, Upin & Ipin is the longest-running Malaysian animated series, currently in its 17th year of production, and is currently in its 18th season.

Upin & Ipin has received consistently high viewership in Malaysia on both broadcast television and video-on-demand services. It has influenced the development of merchandise, film adaptations and a stage show featuring its characters. The program has been recognised by The Malaysia Book of Records (MBOR) thrice and has won numerous awards, including the 2007 Kuala Lumpur International Film Festival 2007 for Best Animation and the 26th Anugerah Bintang Popular Berita Harian for Most Popular Local Animation Character. It has been praised by television critics for depicting a modern everyday family life.