This book is intended to explain the Contribution of Cultivating Haricot Bean (Phaseolus vulgaris L.) to Rural Household Food Security. Cultivation of crops, particularly Haricot Bean have been playing great role in improving rural household food security. On average, cultivators of Haricot Bean had obtained additional money, which is 7,219.40 Ethiopian Birr per annum as compared to the non- cultivators. Gap in cash was lesser for cultivators as compared to the non-cultivators. The amount of kilocalorie generated per individual per year by cultivators of Haricot Bean was found to be 568153 and for non-cultivators 81998. Again this difference was attributed to contribution of Haricot Bean. The gap in additional kilocalorie requirement of cultivators was lesser (which is 29.2%) as compared to the non-cultivators (which is 89.8%). I hope that every reader will get a very good knowledge and understanding about the contribution of cultivating Haricot Bean to rural household food security.