The Samsung Galaxy Note 20 and Galaxy Note 20 Ultra are a series of high-end Android-based phablets designed, developed, produced, and marketed by Samsung Electronics as part of their Samsung Galaxy Note series, succeeding the Samsung Galaxy Note 10 series. The phablets were announced on 5 August 2020 alongside the Samsung Galaxy Z Fold 2, Galaxy Watch 3, Galaxy Buds Live and Samsung Galaxy Tab S7 during Samsung's Unpacked Event. It was the final model in the Galaxy Note series, with Samsung beginning to integrate the functionality from the Note series into its S series "Ultra" models, starting with the Galaxy S20 Ultra.

One UI is a user interface (UI) developed by Samsung Electronics for its Android devices running Android 9 "Pie" and later. Succeeding Samsung Experience and TouchWiz, it is designed to make using larger smartphones easier and be more visually appealing. To provide more clarity, some elements of the UI are tweaked to match colors that are based on the color of the user's phone. It was announced at Samsung Developer Conference in 2018, and was unveiled in Galaxy Unpacked in February 2019 alongside the Galaxy S10 series, Galaxy Buds and the Galaxy Fold.