Jagdeep Singh Deo s/o Karpal Singh (Punjabi: ਜਗਦੀਪ ਸਿੰਘ ਦਿਓ, romanized: Jagdīp Siṅgh Dio; born 3 May 1971) is a Malaysian politician and lawyer who has served as the Deputy Chief Minister of Penang II since August 2023 and Member of the Penang State Executive Council (EXCO) in the Pakatan Rakyat (PR) and Pakatan Harapan (PH) state administrations under Chief Ministers Lim Guan Eng and Chow Kon Yeow since May 2013 and Member of the Penang State Legislative Assembly (MLA) for Datok Keramat since March 2008.

Jagdeep joined the Democratic Action Party (DAP) in 1994, following in the footsteps of his father, Karpal Singh.

[1] However, he garnered only 38% of the popular vote and was defeated by Koay Kar Huah of the then ruling Barisan Nasional (BN) coalition.

[4] He was subsequently appointed an Executive Councillor in the Penang state government by the then Chief Minister, Lim Guan Eng.

[9][10] He also put in place stringent conditions for prospective home buyers, requiring, for instance, that the applicants of government-built affordable housing units within Penang should be registered voters within the state.