<P> Madam Secretary is an American political drama television series created by Barbara Hall and executive produced by Lori McCreary and Morgan Freeman . It stars Téa Leoni as Elizabeth "Bess" Adams McCord, an ex CIA analyst who becomes the United States Secretary of State . On March 23, 2017, CBS renewed the series for a fourth season, which premiered on October 8, 2017 . As of May 20, 2018, 90 episodes of Madam Secretary have aired, concluding the fourth season . </P> <Table> <Tr> <Th_colspan="2"> Season </Th> <Th_colspan="2"> Episodes </Th> <Th_colspan="2"> Originally aired </Th> </Tr> <Tr> <Th> First aired </Th> <Th> Last aired </Th> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> September 21, 2014 (2014 - 09 - 21) </Td> <Td> May 3, 2015 (2015 - 05 - 03) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> October 4, 2015 (2015 - 10 - 04) </Td> <Td> May 8, 2016 (2016 - 05 - 08) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 23 </Td> <Td_colspan="1"> October 2, 2016 (2016 - 10 - 02) </Td> <Td> May 21, 2017 (2017 - 05 - 21) </Td> </Tr> <Tr> <Td> </Td> <Td_colspan="1"> </Td> <Td_colspan="2"> 22 </Td> <Td_colspan="1"> October 8, 2017 (2017 - 10 - 08) </Td> <Td> May 20, 2018 (2018 - 05 - 20) </Td> </Tr> </Table>

When is the final episode of madam secretary