Gather all ingredients and allow the cream cheese to soften at room temperature.
In a large mixing bowl, beat the cream cheese until light and fluffy.
Add the sweetened condensed milk and continue mixing until completely smooth.
Stir in the fresh lemon juice and lemon zest until fully combined.
Divide the filling evenly between the prepared graham cracker crusts.
Smooth the tops with a spatula.
Refrigerate the Lemon Icebox Pie for at least 2 hours, or until fully set. Chilling overnight creates the best texture.
Before serving, garnish with whipped cream and fresh mint leaves if desired.
Slice and enjoy chilled.