The Survey of Income and Program Participation, part of the United States Census

Simple Internet Protocol Plus, former name of IPv6

Self-invested personal pension, a type of United Kingdom pension plan.

SIPP memory, Single In-line Pin Package, a type of computer memory

SIPp, a free software testing tool for the SIP protocol.

Standard Interline Passenger Procedure, vehicle category codes established to help provide common standards for use when booking car rental services through automated booking systems, as defined by ACRISS.