This paper presents a new lateral reinforcement arrangement in concrete bridge columns. Authors propose the interlocking oval hoop, which will enable wide rectangular columns to be ductile without cross ties and thus reduce the construction work. Quasi-static cyclic loading tests were conducted for specimens with interlocking oval hoops, and flexural performance of columns were discussed with comparisons to columns with rectangular hoops, circular hoops, and interlocking circular hoops. Test results interestingly showed that the reinforced concrete columns with interlocking oval hoops exhibited similar flexural performance to the conventional interlocking columns with circular hoops, when the bending-radius-ratio of the oval is smaller than 2.39.