<Tr> <Td> </Td> <Td> Khawaja Nazimuddin </Td> <Td> 29 April 1943 </Td> <Td> 31 March 1945 </Td> <Td> 7002733000000000000 ♠ 2 years, 2 days </Td> <Td> All - India Muslim League </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> H.S. Suhrawardy </Td> <Td> 23 April 1946 </Td> <Td> 14 August 1947 </Td> <Td> 7002478000000000000 ♠ 1 year, 113 days </Td> <Td> 1946 </Td> </Tr> <Table> <Tr> <Th> No </Th> <Th> Name </Th> <Th> Took office </Th> <Th> Left office </Th> <Th> Duration </Th> <Th> Assembly (election) </Th> <Th_colspan="2"> Party (alliance) </Th> </Tr> <Tr> <Th_colspan="7"> Premier of West Bengal </Th> </Tr> <Tr> <Td> </Td> <Td> Prafulla Chandra Ghosh </Td> <Td> 15 August 1947 </Td> <Td> 22 January 1948 </Td> <Td> 160 days </Td> <Td> Not yet created </Td> <Td> Indian National Congress </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> Bidhan Chandra Roy </Td> <Td> 23 January 1948 </Td> <Td> 25 January 1950 </Td> <Td> 7002733000000000000 ♠ 2 years, 2 days </Td> </Tr> <Tr> <Th_colspan="7"> Chief Minister of West Bengal </Th> </Tr> <Tr> <Td> (2) </Td> <Td> Bidhan Chandra Roy Bowbazar </Td> <Td> 26 January 1950 </Td> <Td> 30 March 1952 </Td> <Td> 7003453900000000000 ♠ 12 years, 156 days (total: 14 years, 158 days) </Td> <Td> Not yet created </Td> <Td> Indian National Congress </Td> <Td> </Td> </Tr> <Tr> <Td> 31 March 1952 </Td> <Td> 5 April 1957 </Td> <Td> First Assembly (1952--57) (January 1952 election) </Td> </Tr> <Tr> <Td> 6 April 1957 </Td> <Td> 2 April 1962 </Td> <Td> Second Assembly (1957--62) (March 1957 election) </Td> </Tr> <Tr> <Td> 3 April 1962 </Td> <Td> 1 July 1962 </Td> <Td> Third Assembly (1962--67) (February 1962 election) </Td> </Tr> <Tr> <Td> </Td> <Td> Prafulla Chandra Sen Arambagh East </Td> <Td> 1 July 1962 </Td> <Td> 28 February 1967 </Td> <Td> 7003170300000000000 ♠ 4 years, 242 days </Td> </Tr> <Tr> <Td> </Td> <Td> Ajoy Kumar Mukherjee Tamluk </Td> <Td> 1 March 1967 </Td> <Td> 21 November 1967 </Td> <Td> 265 days </Td> <Td> Fourth Assembly (1967--68) (February 1967 election) </Td> <Td> Bangla Congress (United Front) </Td> <Td> </Td> </Tr> <Tr> <Td> (1) </Td> <Td> Prafulla Chandra Ghosh Jhargram </Td> <Td> 21 November 1967 </Td> <Td> 19 February 1968 </Td> <Td> 90 days (total: 250 days) </Td> <Td> Independent (Progressive Democratic Front) </Td> <Td> </Td> </Tr> <Tr> <Td>--</Td> <Td> Vacant (President's rule) </Td> <Td> 20 February 1968 </Td> <Td> 25 February 1969 </Td> <Td> 7002371000000000000 ♠ 1 year, 5 days </Td> <Td> Dissolved </Td> <Td> N / A </Td> <Td> </Td> </Tr> <Tr> <Td> (4) </Td> <Td> Ajoy Kumar Mukherjee Tamluk </Td> <Td> 25 February 1969 </Td> <Td> 30 July 1970 </Td> <Td> 7002520000000000000 ♠ 1 year, 155 days </Td> <Td> Fifth Assembly (1969--70) (February 1969 election) </Td> <Td> Bangla Congress (United Front) </Td> <Td> </Td> </Tr> <Tr> <Td>--</Td> <Td> Vacant (President's rule) </Td> <Td> 30 July 1970 </Td> <Td> 2 March 1971 </Td> <Td> 215 days </Td> <Td> Dissolved </Td> <Td> N / A </Td> <Td> </Td> </Tr> <Tr> <Td> (4) </Td> <Td> Ajoy Kumar Mukherjee Tamluk </Td> <Td> 2 April 1971 </Td> <Td> 25 June 1971 </Td> <Td> 84 days (total: 2 years, 139 days) </Td> <Td> Sixth Assembly (1971) (March 1971 election) </Td> <Td> Indian National Congress </Td> <Td> </Td> </Tr> <Tr> <Td>--</Td> <Td> Vacant (President's rule) </Td> <Td> 25 June 1971 </Td> <Td> 19 March 1972 </Td> <Td> 268 days </Td> <Td> Dissolved </Td> <Td> N / A </Td> <Td> </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Siddhartha Shankar Ray Malda </Td> <Td> 20 March 1972 </Td> <Td> 30 April 1977 </Td> <Td> 7003186700000000000 ♠ 5 years, 41 days </Td> <Td> Seventh Assembly (1972--77) (March 1972 election) </Td> <Td> Indian National Congress </Td> <Td> </Td> </Tr> <Tr> <Td>--</Td> <Td> Vacant (President's rule) </Td> <Td> 30 April 1977 </Td> <Td> 20 June 1977 </Td> <Td> 51 days </Td> <Td> Dissolved </Td> <Td> N / A </Td> <Td> </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Jyoti Basu Satgacchia </Td> <Td> 21 June 1977 </Td> <Td> 23 May 1982 </Td> <Td> 7003853800000000000 ♠ 23 years, 137 days </Td> <Td> Eighth Assembly (1977--82) (June 1977 election) </Td> <Td> Communist Party of India (Marxist) (Left Front) </Td> <Td> </Td> </Tr> <Tr> <Td> 24 May 1982 </Td> <Td> 29 March 1987 </Td> <Td> Ninth Assembly (1982--87) (May 1982 election) </Td> </Tr> <Tr> <Td> 30 March 1987 </Td> <Td> 18 June 1991 </Td> <Td> Tenth Assembly (1987--91) (March 1987 election) </Td> </Tr> <Tr> <Td> 19 June 1991 </Td> <Td> 15 May 1996 </Td> <Td> Eleventh Assembly (1991--96) (May 1991 election) </Td> </Tr> <Tr> <Td> 16 May 1996 </Td> <Td> 5 November 2000 </Td> <Td> Twelfth Assembly (1996--2001) (May 1996 election) </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Buddhadeb Bhattacharya Jadavpur </Td> <Td> 6 November 2000 </Td> <Td> 14 May 2001 </Td> <Td> 7003384000000000000 ♠ 10 years, 188 days </Td> </Tr> <Tr> <Td> 15 May 2001 </Td> <Td> 17 May 2006 </Td> <Td> Thirteenth Assembly (2001--06) (May 2001 election) </Td> </Tr> <Tr> <Td> 18 May 2006 </Td> <Td> 13 May 2011 </Td> <Td> Fourteenth Assembly (2006--11) (April--May 2006 election) </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Mamata Banerjee Bhabanipur </Td> <Td> 20 May 2011 </Td> <Td> 25 May 2016 </Td> <Td> 7003236700000000000 ♠ 6 years, 175 days </Td> <Td> Fifteenth Assembly (2011--16) (April--May 2011 election) </Td> <Td> All India Trinamool Congress </Td> <Td> </Td> </Tr> <Tr> <Td> 27 May 2016 </Td> <Td> Incumbent </Td> <Td> Sixteenth Assembly (2016--21) (April--May 2016 election) </Td> </Tr> </Table> <Tr> <Th> No </Th> <Th> Name </Th> <Th> Took office </Th> <Th> Left office </Th> <Th> Duration </Th> <Th> Assembly (election) </Th> <Th_colspan="2"> Party (alliance) </Th> </Tr>

Who has held the office for chief minister for the longest time