When May a Layperson Read the Gospel?

The general rule is that when a priest or deacon is present, they should be the one to proclaim the Gospel.

[W]henever a priest is present, it is more fitting that the office of presiding be assigned to him and that the deacon assist by carrying out those functions proper to the diaconate (Book of Blessings, no. 18).

The only exception to this is on Palm Sunday and Good Friday when the Passion Gospel is divided into several speaking parts.

In the absence of a priest or deacon, a layperson could read the Gospel at a Communion service or other prayer service.