Lead　halide　perovskite　solar　cells　have　rapidly　achieved　high　efficiencies　comparable　to　established　commercial　photovoltaic　technologies.　The　main　focus　of　the　field　is　now　shifting　toward　improving　the　device　lifetime.　Many　efforts　have　been　made　to　increase　the　stability　of　the　perovskite　compound　and　charge-selective　contacts.　The　electron　and　hole　selective　contacts　are　responsible　for　the　transport　of　photogenerated　charges　out　of　the　solar　cell　and　are　in　intimate　contact　with　the　perovskite　absorber.　Besides　the　intrinsic　stability　of　the　selective　contacts　themselves,　the　interfaces　at　perovskite/selective　contact　and　metal/selective　contact　play　an　important　role　in　determining　the　overall　operational　lifetime　of　perovskite　solar　cells.　This　review　discusses　the　impact　of　external　factors,　i.e.,　heat,　UV-light,　oxygen,　and　moisture,　and　measured　conditions,　i.e.,　applied　bias　on　the　overall　stability　of　perovskite　solar　cells　(PSCs).　The　authors　summarize　and　analyze　the　reported　strategies,　i.e.,　material　engineering　of　selective　contacts　and　interface　engineering　via　the　introduction　of　interlayers　in　the　aim　of　enhancing　the　device　stability　of　PSCs　at　elevated　temperatures,　high　humidity,　and　UV　irradiation.　Finally,　an　outlook　is　provided　with　an　emphasis　on　inorganic　contacts　that　is　believed　to　be　the　key　to　achieving　highly　stable　PSCs.　©　2018　WILEY-VCH　Verlag　GmbH　&　Co.　KGaA,　Weinheim