We present various studies of the production of top quarks in proton-proton collisions at 7 TeV with the ATLAS detector at the Large Hadron Collider. The cross-section of top-quark pair production is measured in the single lepton, dilepton, all hadronic channel and channels with tau leptons. Top-quark pairs are also studied in the context of additional radiation. Measurements of single top-quark production in the t-channel and Wt-channel are also presented. Several extensions of the SM predict the presence of new particles that couple to top quarks. We report on searches for such resonance decaying to top-antitop quark pairs.
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