1996 Parliamentary Elections Osei was first elected to Parliament during the 1996 Ghanaian General Elections on the Ticket of the New Patriotic Party representing the
Suame Constituency in the Ashanti Region of Ghana. He polled 47,455 votes out of the 64,394 valid votes cast representing 57.40% against Paul Yeboah an
NDC member who polled 10,828 votes, Azong Alhassan a PNC member who polled 3,219 votes and Habiba Atta a
CPP member who polled 2,892 votes.
2004 Parliamentary Elections Osei was elected as the member of parliament for the
Suame constituency of the
Ashanti Region of
Ghana in the 2004 Ghanaian general elections. He won on the ticket of the
New Patriotic Party. His constituency was a part of the 36 parliamentary seats out of 39 seats won by the
New Patriotic Party in that election for the
Ashanti Region. The
New Patriotic Party won a majority total of 128 parliamentary seats out of 230 seats. He was elected with 48,500 votes out of 59,039 total valid votes cast. This was equivalent to 82.1% of total valid votes cast. He was elected over Agonno Sampson Young of the
People's National Convention, Paul Richard Kofi Yeboah of the
National Democratic Congress and Frederick Antwi of the
Convention People's Party. These obtained 934, 8,448 and 1,157 votes respectively of total valid votes cast. These were equivalent to 1.6%, 14.3% and 2% respectively of total valid votes cast. His constituency was part of the 34 parliamentary seats out of 39 seats won by the
New Patriotic Party in that election for the
Ashanti Region. The
New Patriotic Party won a minority total of 109 parliamentary seats out of 230 seats. He was elected with 45,235 votes out of 57,765 total valid votes cast. This was equivalent to 78.31% of total valid votes cast. He was elected over David Osei Manu of the
National Democratic Congress, Ameyaw Aboagye Peter of
Democratic People's Party and Frederick Antwi-Nsiah of the
Convention People's Party. These obtained 9,742, 2,409 and 379 votes respectively of the total valid votes cast. These were equivalent to 37.59%, 5.43% and 1.28% respectively of the total votes cast.
2020 Parliamentary Elections He again contested the
2020 Ghanaian general election as the parliamentary candidate for the
New Patriotic Party. Hon. Osei Kyei Mensah Bonsu contested with four other candidates, which include Dodoovi Francis of the
National Democratic Congress, Sulemana Mohammed of the Convention People's Party, Mohammed Mubarak of the All People Congress and the Independent candidate. At the end of the polls, the Incumbent Member of Parliament for Suame, Hon. Osei Kyei Mensah Bonsu, won the seat again for the New Patriotic Party NPP with 67,095 votes representing 76.1%, the National Democratic Congress NDC candidate Dodoovi Francis gathered 9,312 votes representing 10.6% of total valid votes cast. While the
Convention People's Party Sulemana Mohammed manage with 299 votes which means he gathered 0.3% of the total valid votes cast. All People Congress also had 213 votes making 0.2% of the total vote cast. Finally the Independent candidate George Prempeh also came second with 11,217 votes making 12.7%of the total vote cast. == Commonwealth Parliamentary Association (CPA) Elections ==