A multi-band uniplanar MIMO antenna for mobile devices, covering Long Term Evolution (LTE) and Wireless Local Area Network (WLAN) bands is proposed. The antenna features two radiating elements composed of direct-fed and couple-fed monopoles with parasitic structures to allow wideband coverage. The MIMO design features four main operating bands, 695–963, 1790–2650, 3520–3702, and 5565–6348 MHz. The dimensions of the proposed MIMO antenna are 115mm × 55mm × 0.8mm with simple geometries that can easily be integrated into 4G LTE mobile devices.