Due　to　the　dynamism　of　topology,　sharing　of　bandwidth　and　constraint　of　resources　in　wireless　nodes,　the　provision　of　quality　of　service　(QoS)　for　routing　in　mobile　ad　hoc　networks　(MANETs)　presents　a　great　challenge.　Security　is　another　crucial　aspect　of　providing　QoS　since　the　existence　of　malicious　nodes　present　all　kinds　of　threats　to　MANETs.　Although　a　number　of　mechanisms　have　been　proposed　for　protecting　MANETs,　most　of　the　solutions　are　only　effective　for　a　particular　kind　of　attacks　or　provide　security　at　the　cost　of　sacrificing　QoS.　In　this　paper,　we　propose　a　trust-based　secure　QoS　routing　scheme　by　combining　social　and　QoS　trust.　The　primary　approach　of　the　proposed　scheme　relies　on　mitigating　nodes　that　exhibit　various　packet　forwarding　misbehavior　and　on　discovering　the　path　that　ensures　reliable　communication　through　the　trust　mechanism.　The　scheme　would　select　the　best　forwarding　node　based　on　packet　forwarding　behavior　as　well　as　capability　in　terms　of　QoS　parameters,　such　as　residual　energy,　channel　quality,　link　quality,　etc.　We　will　present　an　adversary　model　for　packet　dropping　attack　against　which　we　evaluate　the　proposed　scheme.　Simulation　experiment　using　Network　Simulator-2　(NS2)　and　under　various　network　conditions　show　that　mixing　social　and　QoS　trust　parameters　can　greatly　improve　security　and　quality　of　service　routing　in　terms　of　overhead,　packet　delivery　ratio　and　energy　consumption.　©　2018　by　the　author.