2018 Negeri Sembilan state election

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All 36 seats of the Negeri Sembilan State Legislative Assembly 19 seats needed for a majority
Majority party Minority party Third party   PH GS Leader Aminuddin Harun Mohamad Hasan Mustaffa Daharun Party Pakatan Harapan (PKR) Barisan Nasional (UMNO) Gagasan Sejahtera (PAS) Leader since 30 August 2017 2004 Unknown Leader's seat Sikamat Rantau Ampangan (lost seat) Last election 14 seats, 35.36% (Pakatan Rakyat) 22 seats, 50.95% No seat, 12.05% (Pakatan Rakyat) Seats before 14 21 Seats won 20 16 0 Seat change 6 5 Popular vote 258,737 182,294 35,913 Percentage 53.9% 38.0% 7.5% Swing 18.5% 13.0% 4.6%
Pakatan Harapan seats:   DAP   PKR   Amanah Opposition seats:   UMNO and MIC
Menteri Besar before election Mohamad Hasan Barisan Nasional Elected Menteri Besar Aminuddin Harun Pakatan Harapan

The 14th Negeri Sembilan State election was held on 9 May 2018, to elect the State Assemblymen of the Negeri Sembilan State Legislative Assembly, the legislature of the Malaysian state of Negeri Sembilan. The previous state election was held on 5 May 2013. The state assemblymen is elected to 5 years term each.

The Negeri Sembilan State Legislative Assembly was dissolved on 7 April 2018 by the Head of State (Yang di-Pertuan Besar of Negeri Sembilan) on the advice of the Head of Government (Menteri Besar of Negeri Sembilan).

The election was held concurrently with the 2018 Malaysian general election.

In a historic result, Barisan Nasional (BN), the ruling coalition was ousted from power by Pakatan Harapan (PH). Since the first Negeri Sembilan state election in 1955, BN or its predecessor Alliance had never lost the state election. PH won 20 seats in the election, gaining a simple majority, while BN won 16. Aminuddin Harun from PH's component party PKR was sworn in as new Menteri Besar on 12 May 2018.^[1]

Barisan Nasional (BN) contested in all 36 seats in Negeri Sembilan State Legislative Assembly. United Malays National Organisation (UNMO) contested in 22 seats, Malaysian Chinese Association (MCA) contested in 10 seats, Malaysian Indian Congress (MIC) and Parti Gerakan Rakyat Malaysia (Gerakan) contested in 2 seats each.

Pakatan Harapan (PH) contested in 35 seats in Negeri Sembilan. People's Justice Party (PKR) contested in 11 seats, Democratic Action Party (DAP) contested in 11 seats, Malaysian United Indigenous Party (Bersatu) contested in 6 seats and National Trust Party (Amanah) contested in 7 seats.

Pan-Malaysian Islamic Party (PAS) contested in 27 seats in Negeri Sembilan and lost in all of them.

No.	State constituency	Incumbent State Assemblyman	Political parties
			Barisan Nasional[2][3]		Pakatan Harapan[4]		Gagasan Sejahtera[5]		Other parties/Ind
			Candidate Name	Party	Candidate Name	Party	Candidate Name	Party	Candidate Name	Party
N01	Chennah	Anthony Loke Siew Fook (PH)	Seet Tee Yin	MCA	Anthony Loke Siew Fook	DAP	Jamalus Mansor	PAS
N02	Pertang	Jalaluddin Alias (BN)	Noor Azmi Yusuf	UMNO	Osman Mohd Dusa	Bersatu	Hamran Abu Hassan
N03	Sungai Lui	Mohd Razi Mohd Ali (BN)	Mohd Razi Mohd Ali		Zainal Fikri Abd Kadir	PKR	Abdul Karim Shahimi Abdul Razak
N04	Klawang	Yunus Rahmat (BN)	Baharuddin Jali		Bakri Sawir	Amanah	Mazly Yasin
N05	Serting	Shamsulkahar Mohd Deli (BN)	Shamsulkahar Mohd Deli		Abd Rahman Ramli		Muhammad Alzukri Muhammad Yasin
N06	Palong	Lilah Yasin (BN)	Mustafa Nagoor		Nor Arzemi Nordin	Bersatu	Masdi Musa
N07	Jeram Padang	Manickam Letchuman (BN)	Manickam Letchuman	MIC	S. Musliadi Sabtu	PKR	Mohd Fairuz Mohd. Isa		Surash Sreenivasan	IND
N08	Bahau	Chew Seh Yong (PH)	Choong Wan You	MCA	Teo Kok Seong	DAP	Mustafar Bakri Abdul Aziz
N09	Lenggeng	Vacant	Mazlan Maarop	UMNO	Suhaimi Kassim	Amanah	Muhammad Ghazali Abu Bakar
N10	Nilai	Arul Kumar Jambunathan (PH)	Leaw Kok Chan	MCA	Arul Kumar Jambunathan	DAP	Mohd. Abu Zahrim Abdul Rahman
N11	Lobak	Siow Kim Leong (PH)	Lim Kok Kean		Chew Seh Yong				Balamurugan Sanmugam	PAP
N12	Temiang	Ng Chin Tsai (PH)	Siow Koi Voon		Ng Chin Tsai		Yaw Con Seng	PAS
N13	Sikamat	Aminuddin Harun (PH)	Samsul Amri Ismail	UMNO	Aminuddin Harun	PKR	Rahim Yusof		Bujang Abu	IND
N14	Ampangan	Abu Ubaidah Redza (BN)	Abu Ubaidah Redza		Mohamad Rafie Ab. Malik		Mustaffa Daharun
N15	Juasseh	Mohammad Razi Kail (BN)	Ismail Lasim		Rosli Omar		Hassan Mohamed
N16	Seri Menanti	Abd Samad Ibrahim (BN)	Abd Samad Ibrahim		Jamali Salam	Bersatu	Rafiei Mustapha
N17	Senaling	Ismail Lasim (BN)	Adnan Abu Hasan		Md Rais Mohamad @ Basiron	Amanah	Fazilah Abu Samah
N18	Pilah	Norhayati Omar (BN)	Norhayati Omar1		Mohamad Nazaruddin Sabtu	PKR	Ahmad Fadzil Othman
N19	Johol	Abu Samah Mahat (BN)	Saiful Yazan		Zulkefly Mohamad	Amanah	Kamaruddin Md. Tahir
N20	Labu	Hasim Rusdi (BN)	Hasim Rusdi		Ismail Ahmad	PKR	Mohd. Khairil Anuar Mohd. Wafa		David Dass Aseerpatham	PAP
N21	Bukit Kepayang	Cha Kee Chin (PH)	Mah Kah Yong	Gerakan	Tan Lee Koon	DAP
N22	Rahang	Mary Josephine Pritam Singh (PH)	Yap Sui Moi	MCA	Mary Josephine Pritam Singh				Saraswathy Paragazum	PAP
N23	Mambau	Yap Yew Weng (PH)	Hoi Choi Sin		Yap Yew Weng				T. Parimala Devi	PAP
N24	Seremban Jaya (previously known as Senawang)	Gunasekaren Palasamy (PH)	Choong Vee Hing	Gerakan	Gunasekaren Palasamy				Sagaya Rajan Xavier	PAP
N25	Paroi	Mohd Ghazali Wahid (BN)	Mohd Ghazali Wahid	UMNO	Mohamad Taufek Abd Ghani	Amanah	Masita Mohamed Ali	PAS
N26	Chembong	Zaifulbahri Idris (BN)	Zaifulbahri Idris		Azizan Marzuki	Bersatu	Rosmin Adam
N27	Rantau	Mohamad Hasan (BN)	Mohamad Hasan
N28	Kota	Awaludin Said (BN)	Awaludin Said		Shahrizal Masrudin	Amanah	Ishak Omar	PAS
N29	Chuah	Chai Tong Chai (PH)	Lim Chin Sui	MCA	Yek Diew Ching	PKR
N30	Lukut	Ean Yong Tin Sin (PH)	Yeong Con Yu		Choo Ken Hwa	DAP
N31	Bagan Pinang	Tun Hairuddin Abu Bakar (BN)	Tun Hairuddin Abu Bakar	UMNO	Rashid Latiff	Bersatu
N32	Linggi	Abd Rahman Mohd Redza (BN)	Abd Rahman Mohd Redza		Rusli Abdullah	PKR	Noor Mohamad Rizal Ishak	PAS
N33	Sri Tanjung (previously known as Port Dickson)	Ravi Munusamy (PH)	Thinalan Rojagapalu	MIC	Ravi Munusamy		Kamarol Ridzuan Mohd. Zain
N34	Gemas	Abdul Razak Said (BN)	Abdul Razak Said	UMNO	Baharuddin Arif Siri	PKR	Abdul Halim Abu Bakar
N35	Gemencheh	Mohd Isam Mohd Isa (BN)	Mohd Isam Mohd Isa		Saiful Adly Abdul Wahab	Bersatu	Ishak Maasin
N36	Repah	Veerapan Superamaniam (PH)	Pui Kim Swee	MCA	Veerapan Superamaniam	DAP	Abdul Razakek Abdul Rahim

No.	Seat	Previous Party (2013)			Current Party (2018)
N04	Klawang		Barisan Nasional (UMNO)		Pakatan Harapan (AMANAH)
N09	Lenggeng		Barisan Nasional (UMNO)		Pakatan Harapan (AMANAH)
N14	Ampangan		Barisan Nasional (UMNO)		Pakatan Harapan (PKR)
N18	Pilah		Barisan Nasional (UMNO)		Pakatan Harapan (PKR)
N20	Labu		Barisan Nasional (UMNO)		Pakatan Harapan (PKR)
N25	Paroi		Barisan Nasional (UMNO)		Pakatan Harapan (AMANAH)

The 14th General Election witnessed 20 governmental seats and 16 non-governmental seats filled the Negeri Sembilan State Legislative Assembly. The government side has 11 safe seats and 1 fairly safe seat, while the non-government side has 3 safe seats and 3 fairly safe seats. In addition, there were 1 seat that win uncontested in non-governmental seats; namely Rantau (won by incumbent assemblyman, Mohamad Hasan).

Rantau constituency incumbent assemblyman and Barisan Nasional candidate Mohamad Hasan won his seat uncontested after People's Justice Party (PKR)’s candidate Dr Streram Sinnansamy was not allowed to enter the Nomination Centre to file his papers by the Election Commission (EC), supposedly because he did not have in his possession a pass issued by the Election Commission.^[8][9] However, the Election Court has on the 16 November 2018, allowed the petition by Dr S. Streram and passed a ruling that Mohamad Hasan had not been duly elected, subsequently nullified Hasan's result.^[10] A by-election was then held on 13 April 2019 after Mohamad Hasan's appeal was dismissed by the Federal Court on 18 February 2019. Mohamad Hasan somehow emerged victorious and managed to retain his seat again.^[11]