Who uses the Revised Common Lectionary?
The above denominations follow the RCL to various degrees in their worship. The Roman Catholic, Episcopal, and Lutheran churches use variant readings on certain feast days. In addition, individual congregations from the free church tradition often adopt the RCL as an ecumenical act of fellowship. The RCL is generally used as a guide rather than as a constraint in most traditions. You can read more about the usage of the RCL at the CCT website here.