A computer-implemented method for connecting to digital groups using machine-readable code may include (1) using an image sensor on a user's mobile device to digitally scan a machine-readable code associated with a digital social group organized via a social-networking platform and (2) using a system processor of the user's mobile device to (i) decode a data item, encoded in the machine-readable code, that includes a hash string to be sent to a server managed by the social-networking platform, (ii) send, to the server, the hash string encoded in the machine-readable code, and (iii) present, via a display element of the user's mobile device, a group page of the digital social group sent by the server in response to the server receiving the hash string. Various other methods, systems, and computer-readable media are also disclosed.