Baluns are transformers commonly used to connect RF coils to coaxial cables. For dual-tuned RF coils, baluns suppress the common-mode current at the Larmor frequencies for both proton and X-nuclear. This can be realized by utilizing separated single-frequency baluns in series or utilizing dual-band baluns. The LC lattice balun is widely used in RF coils since it can be built directly on the coils’ feeding board and uses minimal space. In this work, we introduce a dual-band Lattice balun design to fit the multinuclear MRI application. We analyzed, simulated and constructed the dual-band lattice balun for the 7T H/Na application.