The present document includes the specification of the 3GPP SMIL Language Profile. The 3GPP SMIL Language Profile is also referred to as "3GPP PSS SMIL Language Profile" [3] and also just "3GPP SMIL". The 3GPP SMIL Language Profile is based on SMIL 2.0 Basic [7] and SMIL Scalability Framework. It is a clean subset of SMIL 2.0 Full profile [7], and a clear superset of SMIL 2.0 Basic [7]. The 3GPP SMIL Language Profile is used by the PSS [2][3] and MMS [6] services. The 3GPP SMIL Language Profile is in no way restricted to be used with only these services, but can also be used for other services.