With the growing popularity of online communities on social media, non-profit organizations have the possibility to easily reach and communicate with the public. Furthermore, small non-profit organizations with few resources are able to use online communities, not only to market their activities but also to build a closer bond with its members. However, non-profit organizations also need community members to engage in the online communities for them to function efficiently. Many small non-profit organizations struggle with engaging their community members in their online communities. This study, therefore, aims to compare how two small non-profit organizations communicate with their community members to create member engagement. The study is a qualitative, comparative case study and is based mainly on theories concerning organizational communication, online communities, and engagement. Data were collected through semi-structured interviews with representatives from the non-profit organizations and through observations of their online communities. The study showed that non-profit organizations communicate their values by using storytelling and displaying emotions in their posts to create engagement. The study further shows that non-profit organizations communicate newsworthy and qualitative information which is of societal value to engage community members.