Here is the list of your "handful":

Africa
MOBUTU SESE SEKO
Dictator of Zaire 1965-1997
MOHAMMED SIAD BARRE
President/Dictator of Somalia 1969-1991
GEN. IBRAHIM BABANGIDA
Military Dictator/President of Nigeria 1985-1993
GEN. SANI ABACHA
Dictator of Nigeria 1993-1998
HASTINGS KAMUZU BANDA
Dictator of Malawi 1966-1994
LAURENT-DÉSIRÉ KABILA
President/Dictator of the Democratic Republic of the Congo 1997-2001
GNASSINGBE ETIENNE EYADEMA
Dictator of Togo 1967-2005
FELIX HOUPHOUET-BOIGNY
Dictator/President of the Ivory Coast 1960-1993
HASSAN II
King of Morocco 1961-1999
TEODORO OBIANG NGUEMA MBASOGO
President/Dictator of Equatorial Guinea 1979-present
ZINE EL ABIDINE BEN ALI
President-Prime Minister/Dictator of Tunisia 1987-2011
ANWAR EL-SADAT
President/Dictator of Egypt 1970-1981
HOSNI MUBARAK
President/Dictator of Egypt 1981-present
IAN SMITH
Prime Minister of Rhodesia (white minority regime) 1965-1979
PIETER WILLEM BOTHA
Prime Minister of South Africa (white minority regime) 1978-1984, President 1984-1989
DANIEL ARAP MOI
President/Dictator of Kenya 1978-2002
HAILE SELASSIE (RAS TAFARI)
Emperor of Ethiopia 1928-1974
WILLIAM J. S. TUBMAN
President/Dictator of Liberia 1944-1971
SAMUEL KANYON DOE
Dictator of Liberia 1980-1990

Asia
MOHAMED SUHARTO
Dictator of Indonesia 1966-1998
NGO DINH DIEM
President/Dictator of South Vietnam 1955-1963
GEN. NGUYEN KHANH
Dictator of South Vietnam 1964-1965
NGUYEN CAO KY
Dictator of South Vietnam 1965-1967
GEN. NGUYEN VAN THIEU
President/Dictator of South Vietnam 1967-1975
TRAN THIEM KHIEM
Prime Minister of South Vietnam 1969-75
BAO DAI
Emperor of Vietnam 1926-1945, chief of state 1949-1955
LEE KUAN YEW
Prime Minister/Dictator of Singapore 1959-1990; behind-the scenes ruler since then.
EMOMALI RAHMONOV
President/Dictator of Tajikistan 1992-present
NURSULTAN NAZARBAYEV
President of Kazakhstan 1990-present
ISLAM A. KARIMOV
President/Dictator of Uzbekistan 1990-present
SAPARMURAD ATAYEVICH NIYAZOV
President/Dictator of Turkmenistan 1990-2006
MARSHAL LUANG PIBUL SONGGRAM
Dictator of Thailand 1948-1957
FIELD MARSHAL THANOM KITTIKACHORN
Prime Minister/Dictator of Thailand 1957-58, 1963-1973
CHIANG KAI-SHEK
President/Dictator (Nationalist) of China 1928-1949
President/Dictator of Taiwan 1949-1975
CHIANG CHING-KUO
President/Dicator of Taiwan 1978-1988; Prime Minister 1972-1978
DENG XIAOPING
De facto ruler of China from circa 1978 to the early 1990s
FERDINAND MARCOS
President/Dictator of the Philippines 1965-1986
SYNGMAN RHEE
President/Dictator of South Korea 1948-1960
GEN. PARK CHUNG HEE
President/Dictator of South Korea 1962-1979
GEN. CHUN DOO HWAN
President/Dictator of South Korea 1980-1988
SIR MUDA HASSANAL BOLKIAH
Sultan of Brunei 1967-present
GEN. LON NOL
Prime Minister/Dictator of Cambodia 1970-1975
POL POT
Dictator of Cambodia 1975-1979
MAJ. GEN. SITIVENI RABUKA
Dictator of Fiji 1987-1999
ASKAR AKAYEV
President of Kyrgyzstan 10/27/1990-2005

Europe
FRANCISCO FRANCO
Dictator of Spain 1939-1975
ANTONIO SALAZAR DE OLIVEIRA
Dictator of Portugal 1928-1968
COL. GEORGIOS PAPADOPOULOS
Prime Minister/President/Dictator of Greece 1967-1973

Latin America
ANASTASIO SOMOZA GARCIA
Dictator of Nicaragua 1937-1947, 1950-1956
ANASTASIO "TACHITO" SOMOZA DEBAYLE
Dictator of Nicaragua 1967-1972, 1974-1979
MANUEL ESTRADA CABRERA
Dictator of Guatemala 1898-1920
GEN. JORGE UBICO CASTANEDA
Dictator of Guatemala 1931-1944
COL. CARLOS ENRIQUE CASTILLO ARMAS
Dictator of Guatemala 1954-1957
GEN. JOSE MIGUEL YDIGORAS FUENTES
President/Dictator of Guatemala 1958-1963
COL. ENRIQUE PERALTA AZURDIA
Military Junta, Guatemala 1963-1966
COL.CARLOS ARANA OSORIO
Dictator of Guatemala 1970-1974
GEN. FERNANDO ROMEO LUCAS GARCIA
Dictator of Guatemala 1978-1982
GEN. JOSE EFRAIN RIOS MONTT
Dictator of Guatemala 1982-1983
MARCO VINICIO CEREZO ARÉVALO
President/Dictator of Guatemala 1986-1991
MAXIMILIANO HERNANDEZ MARTINEZ
Dictator of El Salvador 1931-1944
COL. OSMIN AGUIRRE Y SALINAS
Dictator of El Salvador 1944-1945
CIVILIAN-MILITARY JUNTA, EL SALVADOR
1961-1962
COL. ARTURO ARMANDO MOLINA BARRAZA
Dictator of El Salvador 1972-1977
JUNTA, EL SALVADOR
1979-1982
ALFREDO FÉLIX CRISTIANI BUKARD
President/Dictator of El Salvador 1989-1994
TIBURCIO CARIAS ANDINO
Dictator of Honduras 1932-1948
COL. OSWALDO LOPEZ ARELLANO
Dictator of Honduras 1963-1975
ROBERTO SUAZO CORDOVA
President/Dictator of Honduras 1982-1986
GEN. OMAR HERRERA-TORRIJOS
Dictator of Panama 1969-1981
GEN. MANUEL ANTONIO MORENA NORIEGA
Dictator of Panama 1982-1989
AUGUSTO PINOCHET UGARTE
Dictator of Chile 1973-1990
GEN. JORGE RAFAEL VIDELA
Dictator of Argentina 1976-1981
COL. MARCOS PEREZ JIMENEZ
Dictator of Venezuela 1950-1958
GEN. ALFREDO STROESSNER
Dictator of Paraguay 1954-1989
ALBERTO FUJIMORI
Dictator of Peru 1990-2000
FRANCOIS "PAPA DOC" DUVALIER
Dictator of Haiti 1957-1971
JEAN-CLAUDE "BABY DOC" DUVALIER
Dictator of Haiti 1971-1986
MILITARY JUNTA / LT. GEN. RAOUL CEDRAS, GEN. PHILIPPE BIAMBY and LT. COL. MICHEL-JOSEPH FRANCO
Haiti 1991-1994
GEN. RENE BARRIENTOS ORTUNO
President/Dictator of Bolivia 1964-1969
GEN. HUGO BANZER SUAREZ
Dictator of Bolivia 1971-1978
DR. GETULIO VARGAS
Dictator of Brazil 1930-1945, 1951-1954
GEN. HUMBERTO DE ALENCAR CASTELLO BRANCO
Dictator of Brazil 1964-1967
CARLOS PRIO SOCARRAS
Dictator of Cuba 1948-1952
FULGENCIO BATISTA
Dictator of Cuba 1933-44, 1952-1959
GERARDO MACHADO MORALES
Dictator of Cuba 1925-1933
RAFAEL LEONIDAS TRUJILLO
Dictator of the Dominican Republic 1930-1961

Middle East
MOHAMMED REZA PAHLAVI
Shah of Iran 1941-1979
SADDAM HUSSEIN
Dictator of Iraq 1969 (1979)-2003
GEN. MOHAMMED AYUB KHAN
President/Dictator of Pakistan 1958-1969
GEN. AGHA MUHAMMAD YAHYA KHAN
President/Dictator of Pakistan 1969-1971
GEN. MOHAMMAD ZIA UL-HAQ
President/Dictator of Pakistan 1977-1988
PERVEZ MUSHARRAF
Dictator of Pakistan 1999-2008
ABDUL IBN HUSSEIN I
King of Jordan 1952-1999
TURGUT ÖZAL
Prime Minister of Turkey 1983-1989, President 1989-1993
SHEIK JABIR AL-AHMAD AL SABAH
Emir of Kuwait 1977-2006
Prime Minister of Kuwait 1962-1963, 1965-1978
FAHD IBN ABDUL-AZIZ AL SAUD
King and Prime Minister of Saudi Arabia 1982-2005