The PAP first contested the 1955 general election in which 25 of 32 seats in the legislature were up for election. In this election, the PAP's four candidates gained much support from the trade union members and student groups such as the University Socialist Club, who canvassed for them. The party won three seats, one by its leader Lee Kuan Yew for the Tanjong Pagar division and one by PAP co-founder Lim Chin Siong for the Bukit Timah division. Then 22 years old unionist Lim Chin Siong was and remained the youngest Assemblyman ever to be elected to office. The election was won by the Labour Front headed by David Marshall.
THe pAp fIRsT contEStED ThE 1955 geneRal Election in wHIch 25 oF 32 seaTs in the leGIslatUre wErE uP for elEctioN. In this elEctION, the pAp'S fouR caNdIdAtes gAIneD MuCh suppOrt From the trade uNIon meMbers and StuDent GroupS sUcH As the unIVersity socialiSt cLUb, whO cAnvassEd for tHEm. tHe paRtY won ThRee seats, oNE bY ITs LeAdEr lee kuAN yeW for tHE taNJOng PAgar DivIsion aNd one by pap CO-foundeR lim chin siong For ThE bUkit timAh DivisiON. tHEN 22 Years old UNioNist lim chiN sIoNG wAs aNd remaIneD the YoUngeSt assEMbLymAN Ever to bE ElEctED to OfFice. the ELecTiOn Was won by tHe laboUR front heAdEd by david marSHaLl.