Abstract: A cup holder insert having an insert assembly, a support assembly, and a cup holder assembly is disclosed herein. The adjustable large cup holder insert includes three assemblies each having a specific shape to cooperate with each other. Additionally, the adjustable large cup holder insert is configured to be fitted into an existing cup holder in a vehicle or wherever else a cup holder is found. Each assembly of the adjustable large cup holder insert is fitted into each other to provide a secure attaching means to an existing cup holder. Furthermore, the three assemblies include a cup holder assembly which can be shifted across a support assembly to provide an optimal position for a placing a large cup for a user. The cup holder insert provides a user with an efficient way of securing a large cup to an existing cup holder.