The top quark mass in dileptonic top quark pair decays is measuredusing $4.7~\mathrm{fb}^{-1}$ of proton-proton collision data recordedat the centre of mass energy $\sqrt{s}=7~\mathrm{TeV}$ by the ATLASexperiment at the LHC in 2011. The event topology is characterisedby the presence of two charged leptons, at least two neutrinos, andseveral jets, two of which originate from bottom quarks. Using thetemplate method and the m$_{\ell b}$ observable, defined as the averageinvariant mass of the two lepton plus $b$-jet pairs in each event,the top quark mass is measured to be $173.09 \pm 0.64_\mathrm{stat}\pm 1.50_\mathrm{syst}~\mathrm{GeV}$
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