The ATLAS experiment at the CERN Large Hadron Collider (LHC) has intensively searched for supersymmetry (SUSY) since the discovery of the Higgs boson in 2012. This search program expanded in both breadth and depth, benefiting from increased integrated luminosity and higher center-of-mass energy for collision data collected between 2-2018. The report summarizes the SUSY searches using up to 140 fb\(^{-1}\) of \(pp\) collisions at \(\sqrt{s} = 13\) TeV, including limits set on the production of gluinos, squarks, and electroweakinos for scenarios with or without R-parity conservation, and models where some SUSY particles are long-lived. The ATLAS detector is a multipurpose particle detector with a forward-backward symmetric cylindrical geometry and nearly \(\sim4\pi\) coverage in solid angle. The analyses designed to complement each other target various event topologies arising from the production and decay of SUSY particles, employing a variety of tools and techniques. The analysis strategy involves defining signal regions (SRs) by maximizing the significance of the targeted signal process relative to SM background, using Monte Carlo simulations. Background estimation often includes data in control regions, and the final background level is adjusted after background estimation. The statistical approach tests compatibility with SM background predictions and sets limits on SUSY production cross-sections and sparticle masses. The sensitivity to gluino pair production is shown in Figure 5, with limits presented as a function of gluino mass and lightest neutralino mass. Different curves represent different assumptions about gluino decay chains. The simplest RPC Feynman vertex involves a gluino coupling to a squark and a quark, with various decay scenarios considered. The sensitivity to squark pair production is also discussed, with limits presented in Figure 8, assuming eightfold mass degeneracy for squarks. Third-generation squarks ($\tilde{b}$ and $\tilde{t}$) are targeted by dedicated analyses, with limits shown in Figure 9. Overall, the ATLAS searches have set significant exclusion limits on SUSY particles, contributing to our understanding of the fundamental nature of matter and the universe.The ATLAS experiment at the CERN Large Hadron Collider (LHC) has intensively searched for supersymmetry (SUSY) since the discovery of the Higgs boson in 2012. This search program expanded in both breadth and depth, benefiting from increased integrated luminosity and higher center-of-mass energy for collision data collected between 2-2018. The report summarizes the SUSY searches using up to 140 fb\(^{-1}\) of \(pp\) collisions at \(\sqrt{s} = 13\) TeV, including limits set on the production of gluinos, squarks, and electroweakinos for scenarios with or without R-parity conservation, and models where some SUSY particles are long-lived. The ATLAS detector is a multipurpose particle detector with a forward-backward symmetric cylindrical geometry and nearly \(\sim4\pi\) coverage in solid angle. The analyses designed to complement each other target various event topologies arising from the production and decay of SUSY particles, employing a variety of tools and techniques. The analysis strategy involves defining signal regions (SRs) by maximizing the significance of the targeted signal process relative to SM background, using Monte Carlo simulations. Background estimation often includes data in control regions, and the final background level is adjusted after background estimation. The statistical approach tests compatibility with SM background predictions and sets limits on SUSY production cross-sections and sparticle masses. The sensitivity to gluino pair production is shown in Figure 5, with limits presented as a function of gluino mass and lightest neutralino mass. Different curves represent different assumptions about gluino decay chains. The simplest RPC Feynman vertex involves a gluino coupling to a squark and a quark, with various decay scenarios considered. The sensitivity to squark pair production is also discussed, with limits presented in Figure 8, assuming eightfold mass degeneracy for squarks. Third-generation squarks ($\tilde{b}$ and $\tilde{t}$) are targeted by dedicated analyses, with limits shown in Figure 9. Overall, the ATLAS searches have set significant exclusion limits on SUSY particles, contributing to our understanding of the fundamental nature of matter and the universe.