Sharecast - Della Valle took over as interim CEO in January, following the departure of Nick Read.
Chairman Jean-François van Boxmeer said: "Margherita has a strong track record during her long career at Vodafone in marketing, operational, commercial and financial positions. Over the last few months as interim group chief executive, the board and I have been impressed with her pace and decisiveness to begin the necessary transformation of Vodafone.
"Margherita has the full support of myself and the board for her plans for Vodafone to provide better customer experience, become a simpler business and accelerate growth."
In addition to being appointed group CEO, Della Valle will continue as group chief financial officer until an external search for a new CFO is complete.
