Bishan-Toa Payoh Group Representation Constituency (Chinese: 碧山-大巴窑集选区; Malay: Kawasan Undi Perwakilan Berkumpulan Bishan-Toa Payoh; Tamil: பீஷான்-தோ பாயோ குழுத்தொகுதி) is a five-member Group Representation Constituency (GRC) located in the central region of Singapore. The GRC consists the entire areas of Bishan, Singapore, the majority of Toa Payoh, parts of Thomson, Singapore. Its sub-constituencies are Thomson, Singapore, Bishan East, Bishan North Bishan, Singapore, Sin Ming, Shun Fu, Toa Payoh West, Toa Payoh East Toa Payoh Central.
The GRC was formed in 1997 by merging the Bishan East, Bishan North, and Thomson divisions of the Thomson Group Representation Constituency with that of the Toa Payoh Group Representation Constituency. The remaining Serangoon Gardens Division was split between three GRCs, namely Aljunied, Ang Mo Kio and Marine Parade.
Bishan-Toa Payoh GRC was first headed by Deputy Prime Minister Wong Kan Seng until his retirement in 2015. Currently, it is headed by Minister for Defence Dr Ng Eng Hen, Minister for Manpower (and Second Minister of Home Affairs) Josephine Teo, and Senior Minister of State Chee Hong Tat.
Both the Thomson and Toa Payoh GRCs were uncontested since the 1991 General Elections, with the Bishan-Toa Payoh GRC enjoying the same situation from 1997 until 2011, with the first contest is with Singapore People’s Party led by former opposition leader Chiam See Tong. Its boundaries also remained intact throughout its existence until 2015 when it was expanded in size to include Balestier, MacRitchie Reservoir and Novena. In 2020, Bishan North was carved into Marymount Single Member Constituency and reducing the size to four seats, while Balestier and Novena was subsumed into the neighbouring Jalan Besar GRC and in return, Blocks 210 to 224 from the former opposition constituency of Potong Pasir were absorbed into Toa Payoh East.