Lanark was a county constituency of the House of Commons of the Parliament of the United Kingdom (Westminster) from 1918 to 1983. It elected one Member of Parliament (MP) by the first past the post voting system.

There was also an earlier Lanark Burghs constituency, from 1708 to 1832.

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From 1918 the constituency consisted of "The Upper Ward County District, inclusive of all burghs situated therein, together with the part of the Middle Ward County District which is contained within the parishes of Avondale, East Kilbride, Glassford, and Stonehouse."

The Representation of the People Act 1948 provided that the constituency was to consist of "(i) The burghs of Biggar and Lanark; and (ii) the first, second and third districts and, so far as not included in the Hamilton constituency, the fourth and fifth districts."

Election		Member	Party
	1918	Walter Elliot	Unionist
	1923	Thomas Scott Dickson	Labour
	1924	Stephen Mitchell	Unionist
	1929	Thomas Scott Dickson	Labour
	1931	Alec Douglas-Home, Lord Dunglass	Unionist
	1945	Tom Steele	Labour
	1950	Alec Douglas-Home, Lord Dunglass	Unionist
	1951	Patrick Maitland	Unionist
	1959	Judith Hart	Labour
1983		Constituency abolished

General election 1918: Lanark

Party		Candidate	Votes	%	±%
C	Unionist	Walter Elliot	12,976	69.0
	Labour	James C. Welsh	5,821	31.0
Majority			7,155	38.0
Turnout			18,797	68.5
Registered electors			27,434
	Unionist win (new seat)
C indicates candidate endorsed by the coalition government.

General election 1922: Lanark

Party		Candidate	Votes	%	±%
	Unionist	Walter Elliot	12,005	55.0	−14.0
	Labour	Thomas Dickson	9,812	45.0	+14.0
Majority			2,193	10.0	−28.0
Turnout			21,817	75.0	+6.5
Registered electors			29,074
	Unionist hold		Swing	−14.0

General election 1923: Lanark

Party		Candidate	Votes	%	±%
	Labour	Thomas Dickson	11,384	50.5	+5.5
	Unionist	Walter Elliot	11,154	49.5	−5.5
Majority			230	1.0	N/A
Turnout			22,538	74.9	−0.1
Registered electors			30,071
	Labour gain from Unionist		Swing	+5.5

General election 1924: Lanark

Party		Candidate	Votes	%	±%
	Unionist	Stephen Mitchell	12,714	48.4	−1.1
	Labour	Thomas Dickson	11,426	43.5	−7.0
	Liberal	Elizabeth Mitchell	2,126	8.1	New
Majority			1,288	4.9	N/A
Turnout			26,266	84.3	+9.4
Registered electors			31,164
	Unionist gain from Labour		Swing	+3.0

General election 1929: Lanark

Party		Candidate	Votes	%	±%
	Labour	Thomas Dickson	15,054	48.7	+5.2
	Unionist	Stephen Mitchell	12,652	41.0	−7.4
	Liberal	James Mullo Weir	3,177	10.3	+2.2
Majority			2,402	7.7	N/A
Turnout			30,883	78.8	−5.5
Registered electors			39,201
	Labour gain from Unionist		Swing	+6.3

General election 1931: Lanark

Party		Candidate	Votes	%	±%
	Unionist	Alec Douglas-Home, Lord Dunglass	20,675	63.63
	Ind. Labour Party	Jack Gibson	11,815	36.37	N/A
Majority			8,860	27.26	N/A
Turnout			32,490	82.48
	Unionist gain from Labour		Swing

General election 1935: Lanark

Party		Candidate	Votes	%	±%
	Unionist	Alec Douglas-Home, Lord Dunglass	17,759	56.75
	Labour	Jack Gibson	10,950	34.99	N/A
	Ind. Labour Party	William Carlin	2,583	8.25
Majority			6,809	21.76
Turnout			31,292	75.96
	Unionist hold		Swing

General election 1945: Lanark

Party		Candidate	Votes	%	±%
	Labour	Tom Steele	17,784	52.80
	Unionist	Alec Douglas-Home, Lord Dunglass	15,900	47.20
Majority			1,884	5.60	N/A
Turnout			33,684	74.93
	Labour gain from Unionist		Swing

General election 1950: Lanark

Party		Candidate	Votes	%	±%
	Unionist	Alec Douglas-Home, Lord Dunglass	19,890	50.88
	Labour	Tom Steele	19,205	49.12
Majority			685	1.76	N/A
Turnout			39,095	84.70
	Unionist gain from Labour		Swing

General election 1951: Lanark

Party		Candidate	Votes	%	±%
	Unionist	Patrick Maitland	21,467	52.18
	Labour	William L. Taylor	19,674	47.82
Majority			1,793	4.36
Turnout			41,141	97.31
	Unionist hold		Swing

General election 1955: Lanark

Party		Candidate	Votes	%	±%
	Unionist	Patrick Maitland	21,828	51.12
	Labour	John Mackie	20,870	48.88
Majority			958	2.24
Turnout			42,698	85.87
	Unionist hold		Swing

General election 1959: Lanark

Party		Candidate	Votes	%	±%
	Labour	Judith Hart	25,171	50.54
	Unionist	Patrick Maitland	24,631	49.46
Majority			540	1.08	N/A
Turnout			49,802	87.23
	Labour gain from Unionist		Swing

General election 1964: Lanark

Party		Candidate	Votes	%	±%
	Labour	Judith Hart	30,242	54.82
	Unionist	William Beale	24,922	45.18
Majority			5,320	9.64
Turnout			55,164	85.97
	Labour hold		Swing

General election 1966: Lanark

Party		Candidate	Votes	%	±%
	Labour	Judith Hart	29,735	51.65
	Conservative	William Beale	21,995	38.21
	SNP	Harry Rankin	5,838	10.14	New
Majority			7,740	13.44
Turnout			57,568	83.72
	Labour hold		Swing

General election 1970: Lanark

Party		Candidate	Votes	%	±%
	Labour	Judith Hart	30,194	45.03
	Conservative	Alan C.S. MacDougall	27,721	41.35
	SNP	Harry Rankin	7,859	11.72
	Communist	David McDowall	1,273	1.90	New
Majority			2,473	3.68
Turnout			67,047	79.45
	Labour hold		Swing

General election February 1974: Lanark

Party		Candidate	Votes	%	±%
	Labour	Judith Hart	16,823	41.69
	Conservative	Alan C. S. MacDougall	14,723	36.49
	SNP	Thomas McAlpine	8,803	21.82
Majority			2,100	5.20
Turnout			40,349	83.96
	Labour hold		Swing

General election October 1974: Lanark

Party		Candidate	Votes	%	±%
	Labour	Judith Hart	14,948	37.56
	SNP	Thomas McAlpine	14,250	35.81
	Conservative	A Bell	9,222	23.17
	Liberal	Fred McDermid	1,374	3.45	New
Majority			698	1.75
Turnout			39,794	82.21
	Labour hold		Swing

General election 1979: Lanark

Party		Candidate	Votes	%	±%
	Labour	Judith Hart	18,118	43.2	+5.6
	Conservative	A Bell	12,979	30.9	+7.7
	SNP	Thomas McAlpine	7,902	18.8	−17.0
	Liberal	Fred McDermid	2,967	7.1	+3.7
Majority			5,139	12.2	+10.5
Turnout			41,966	81.8	−0.4
	Labour hold		Swing

55°40′26″N 3°46′55″W / 55.674°N 3.782°W / 55.674; -3.782