Techniques and apparatus for sharing hybrid automatic repeat request (HARQ) processes across component carriers (CCs) are described. An example technique involves identifying a carrier aggregation (CA) configuration in which at least a first CC of a plurality of CCs is aggregated with at least a second CC of the plurality of CCs. A HARQ configuration indicating a pool of HARQ processes shared by at least the first CC and the second CC is received from a base station (BS). Communications are performed with the BS on at least one of the first CC or the second CC, based at least in part on the HARQ configuration.