Manganese can be found in various oxidation states in solid-state materials, from 0 to +7. Despite its low stability and scarcity, pentavalent manganese (V) is at the origin of important properties. It can be used to design colorful blue or green pigments. Mn(V) compounds have been considered as laser materials, and also raise interest due to intriguing magnetic properties. Mn(V) is also involved in the oxygen-evolving complex for the production of dioxygen during photosynthesis. This suggests that Mn(V) compounds could find interest for use in water oxidation electrocatalysis, provided that they can be used in conditions where the oxidation state and structural features are maintained. To date, the electrochemical properties, especially the pH-potential stability window of Mn(V) compounds have not been evaluated, so the feasibility of using Mn(V) compounds for electrochemical applications remains an open question.