Digital business transactions in Indonesia reached US$ 1.6 billion in 2021. It showed that the Internet is a very strategic digital marketing tool. From the initial observations of this research, 95% of the fifty training industries in Jakarta stated that digital marketing was very much-needed, and only 20% of the training industry partially implemented digital marketing. This study aims to provide an instrument for establishing digital marketing maturity index indicators. By using a mixed-methods approach, this study concludes that there are six dimensions and twenty-five indicators that represent the digital marketing maturity index, namely: interconnectivity (Business to Business, Customer to Customer, Business to Customer), platform & technology (social media, digital technology, channel), digital relations (digital communication through two-way social media, real-time communication, influencers), leadership and management (vision, mission, plans, programs, and strategies), human resources and human resources (availability of budget, availability of digital skill qualifications), organizational orientation (campaign, and measurement).