||In this work, we design Microcylinders to have multiple distinct structural colors and magnetic functionality. To make such microcylinders, we employ a microfluidic channel with a circular cross-section of which four fans are connected to independent inlets. When four distinct photocurable suspensions of silica or magnetic particles are injected through each inlet, they form a laminar flow with insignificant mixing due to the small Reynolds number. In-situ UV irradiation on the short length of the channel selectively polymerizes the suspension in a very short period of time, thereby creating microcylinders with four distinct quarters. Each quarter can be independently designed to have regular array of silica nanoparticles or magnetic particles. Therefore, magnetoresponsive microcylinders with three distinctively structural colors can be prepared, for example, which are potentially useful as active color pigments for color displays operated at reflection mode.