Ollur State assembly constituency is one of the 140 state legislative assembly constituencies in Kerala. It is also one of the 7 state legislative assembly constituencies included in the Thrissur Lok Sabha constituency. As of the 2021 assembly elections, the current MLA is K. Rajan of CPI.

Ollur was a citadel of Indian National Congress for a long time, yet occasionally it had gone to Communist Party of India. The constituency has 1,00,750 male and 1,07,128 female voters. Ollur has been a bellwether constituency since 1982. Every MLA since 1982 has been part of the ruling party or alliance in Kerala.

Ollur Niyama Sabha constituency is composed of the following 14 wards of the Thrissur Municipal Corporation (Ollur zone, Mannuthy zone and Koorkenchery zone), and 4 Gram Panchayats in Thrissur Taluk:

Wards of Thrissur Municipal Corporation in Ollur Constituency

Ward no.	Name	Ward no.	Name	Ward no.	Name
17	Mullakkara	18	Mannuthy	24	Valarkavu
25	Kuriachira	26	Ancheri	28	Patavarad
29	Edakkunni	30	Thaikkattussery	31	Ollur
32	Chiyyaram South	41	Koorkenchery	42	Kanimangalam
43	Panamukku	44	Nedupuzha

Other Local Bodies in Ollur Constituency

Sl no.	Name	Local Body Type	Taluk
1	Madakkathara	Grama panchayat	Thrissur
2	Nadathara	Grama panchayat	Thrissur
3	Pananchery	Grama panchayat	Thrissur
4	Puthur	Grama panchayat	Thrissur

The following list contains all members of Kerala legislative assembly who have represented the constituency:

Election	Niyama Sabha	Name	Party		Tenure
1957	1st	P. R. Francis		Indian National Congress	1957 – 1960
1960	2nd				1960 – 1965
1967	3rd	A. V. Aryan		Communist Party of India	1967 – 1970
1970	4th	P. R. Francis		Indian National Congress	1970 – 1977
1977	5th				1977 – 1980
1980	6th	Raghavan Pozhakadavil			1980 – 1982
1982	7th				1982 – 1987
1987	8th	A. M. Paraman		Communist Party of India	1987 – 1991
1991	9th	P. P. George		Indian National Congress	1991 – 1996
1996	10th	C. N. Jayadevan		Communist Party of India	1996 – 2001
2001	11th	P. P. George		Indian National Congress	2001 – 2006
2006	12th	Rajaji Mathew Thomas		Communist Party of India	2006 – 2011
2011	13th	M. P. Vincent		Indian National Congress	2011 – 2016
2016	14th	K. Rajan		Communist Party of India	2016 – 2021
2021	15th				Incumbent

2021 Kerala Legislative Assembly election: Ollur

Party		Candidate	Votes	%	±%
	CPI	K. Rajan	76,657	49.09	1.54
	INC	Jose Valloor	55,151	35.31	3.45
	BJP	Adv. B.Gopalakrishnan	22,295	14.28	2.54
	NOTA	None of the above	827	0.51	−
	BSP	P K Subramanian	282	0.18	−
	Independent	{{{candidate}}}	628	0.4	−
	Independent	Benny Kodiyatil	331	0.21	−
Margin of victory			21,506	13.78
	CPI hold		Swing	1.54
Turnout			1,56,171	{{{percentage}}}

There were 1,93,404 registered voters in the constituency for the 2016 election.

2016 Kerala Legislative Assembly election: Ollur

Party		Candidate	Votes	%	±%
	CPI	K. Rajan	71,666	47.55	3.08
	INC	M. P. Vincent	58,418	38.76	10.45
	BDJS	P. K. Santosh	17,694	11.74	−
	NOTA	None of the above	1,151	0.76	−
	PDP	Majeed Mullakara	696	0.46	−
	CPI(ML) Red Star	Sajimon Manjamattam	334	0.22	−
	Independent	Vincent M. D. Marottikkal	279	0.19	−
	Independent	K. G. Rajan	267	0.18
	Independent	V. N. Asokhan	214	0.14	−
Margin of victory			13,248	8.79
	CPI gain from INC		Swing	3.08
Turnout			1,50,719	77.93	3.46

There were 1,76,875 registered voters in the constituency for the 2011 election.

2011 Kerala Legislative Assembly election: Ollur

Party		Candidate	Votes	%	±%
	INC	M. P. Vincent	64,823	49.21
	CPI	Rajaji Mathew Thomas	58,576	44.47
	BJP	Sundararajan	6,761	5.13
	Independent	Suresh M. R.	717	0.54
	BSP	Sunny K. John	434	0.33
	Independent	Ratheesh T. Nair	407	0.31
Margin of victory			6,247	4.74
	INC gain from CPI		Swing
Turnout			1,31,718	74.47

10°29′N 76°14′E / 10.49°N 76.24°E / 10.49; 76.24