The Values in Action Inventory of Strengths for Youth (VIA-Youth) is a self-report inventory assessing 24 character strengths among people 10–17 years of age. This paper describes the adaptation and initial validation of a German version of this measure utilizing several samples (in total N = 2,110 self-reports of participants aged 10–17 years, 56.5% girls; N = 219 parent-reports) from Germany and Switzerland. The 24 scales yielded high reliability and exhibited stability over 4 months. Self-reports and parent-ratings of strengths converged well. An oblique five-factor solution was found to represent the data well. There were small age effects, and small to medium gender effects (e.g., girls scored higher on beauty and kindness). Character strengths of hope, gratitude, love, and zest correlated positively with global life satisfaction. Furthermore, most of the strengths were strong predictors of general self-efficacy. Overall, the German VIA-Youth demonstrated good psychometric properties and promising evidence for validity. The German VIA-Youth is recommended for the assessment of character strengths in German-speaking children and adolescents.