  The discovery of a new type of a heavy long-lived particle (LLP) would be of
fundamental significance due to their existence in many beyond the Standard
Model scenarios. LLPs are anticipated in a wide range of physics models which
extend the Standard Model, such as Supersymmetry and Universal Extra
Dimensions. Since LLPs produced in 7 TeV pp collisions at the CERN LHC can be
slow (beta << 1) and penetrating, time-of-flight and anomalous dE/dx energy
loss measurements are promising ways to search for LLPs. In some cases these
heavy objects may lose all of their energy and come to rest within the densest
parts of the detector volume, decaying later, potentially out-of-time with
collisions from the LHC. We present searches for LLPs using the ATLAS
experiment, describing the techniques used and the results achieved to date.
