Due to the growing interest in environmental issues, electrochemistry and peptide chemistry have recently converged in the field of organic synthesis. In this short review, we introduce the utility of synthetic electrochemistry for the electrochemical modification of peptides and electrochemical synthesis of peptides. The keys for these processes are the use of electroauxiliaries and/or mediators. Although each of these techniques has a long history and already has offered fruitful applications, some recent examples are introduced with particular focus on peptides.