Citizen Science attracts a lot of positive attention and a convenient alignment with it might offer multiple benefits for Community Operational Research. But what would be the basis for such an alignment? Could it offer important reciprocal benefits for Citizen Science? We address our first question by conducting a systematic comparison of Community Operational Research and Citizen Science to reveal points of commonality and difference between the two. Having established the basis for alignment, we then address our second question by exploring how alignment might be realised at micro, meso and macro levels. Through this exploration, we highlight opportunities for Community Operational Research to avail itself of Citizen Science's proximity to policy makers, and we make available to Citizen Science some approaches from Community Operational Research for structuring issues and dealing with contestable knowledge claims.