Monetary and fiscal policy are essential elements of macroeconomic policy. As the main instruments of government in supporting better economic conditions, are often the target of numerous economic critics. From both economic policy is expected to scrupulously and ethical implement their policies in the form of achieving better conditions for citizenship. The fiscal policy, led by the Croatian Government, plays a leading role in achieving economic development, therefore it is often attacked by numerous public criticism. On the other hand, monetary policy is not given so much attention in public. The primary objective of the Croatian national bank, which conducts monetary policy is to maintain price stability and keeping the exchange rate of the national currency, but it is also responsible for determining the amount of money in circulation, interest rates and concern about inflation. The work is consisting of theoretical parts of the above economic policies, as well as the needs of the interactions between them in the case of the Croatian economy, whose interaction is a fundamental prerequisite for achieving economic growth.