Summary: This paper investigates the long-run and short-run relationship between deposit euroization in twelve European post-transition economies and two determinants of deposit euroization that are under the influence of monetary policy: the exchange rate and the interest rate differential. The link between deposit euroization, exchange rates and interest rate differentials is investigated using Johansen cointegration and error correction models for each country separately. The results suggest that changes in both monetary drivers have significant effects on deposit euroization and are therefore important for explaining and fighting deposit euroization. Differences between exchange rate regimes, fixed and managed vs. floating, seem to matter for deposit euroization. The latest economic crisis, aggravated by large currency depreciations in some European post-transition countries and massive defending of hard pegs in others, has emphasized the severity of high financial euroization (FE). FE is not just a temporary consequence of macroeconomic instability experienced in the first period of transition, but a long-lasting phenomenon in almost all European post-transition countries. For twelve countries that record very high FE levels, we investigate two monetary determinants of deposit euroization (DE): the interest rate differential and the exchange rate. We show how DE reacts to changes in those variables and how those responses differ depending on the level of DE and the exchange rate regime in the observed country. This study provides new insights into the relationship between DE and its drivers and unveils the relationship between DE and monetary policy, more specifically central banking. We choose monetary policy because it is most closely related to financial system stability and as such to FE. In addition, this research gives insights into the correlation between the type of the exchange rate regime (fixed vs. floating) and DE, providing a good base for designing deeuroization policies. Lastly, this study considers country-specific characteristics and it includes periods after 2008 marked by strong depreciatory pressures in most countries we explore. Our study extends the research by Marijana Ivanov, Marina Tkalec, and Maruska Vizek (2011) who use similar variables and data samples but for one country only.