Based on the notion that quality and speed of economic growth also affects financial depth, we aim to estimate the interrelations between these two parameters. The aim of this study is to deepen theoretical provisions and methodical approaches to the analysis of the financial depth and financial depth-economic growth nexus as applied to Ukraine. The tasks are 1) to define “financial depth of economy” as well as to study and summarize existing financial depth calculation techniques, their advantages and disadvantages; 2) to determine the main factors and tendencies of financial deepening in different countries, as well as to systematize the main indexes used to evaluate financial depth; 3) to substantiate theoretical and methodical principles of evaluating financial depth – economic growth nexus; 4) to evaluate financial depth in Ukraine; 5) to substantiate interrelation between financial depth and economic growth.