der Parteichef
party leader
The person who leads a political party; the chairperson of a party.
Der neue Parteichef stellte sein Programm für die nächsten vier Jahre vor.
The new party leader presented his program for the next four years.

party leader
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party leader
The person who leads a political party; the chairperson of a party.
Der neue Parteichef stellte sein Programm für die nächsten vier Jahre vor.
The new party leader presented his program for the next four years.

The word is made up of 'die Partei' (the party) and 'der Chef' (the boss). So it literally means 'boss of the party' and is therefore easy to understand.
Der Parteichef ist für die strategische Ausrichtung der Partei verantwortlich.
The party leader is responsible for the party's strategic direction.
The ending '-chef' is often used to refer to the person in charge of an organization. Other examples are 'Firmenchef' (company boss), 'Abteilungschef' (department head), or 'Regierungschef' (head of government).
Der neue Firmenchef hat ehrgeizige Ziele für das Unternehmen.
The new company boss has ambitious goals for the company.
Common verbs used with 'Parteichef' are 'zum Parteichef wählen' (to elect someone party leader), 'als Parteichef zurücktreten' (to step down as party leader), or 'eine Rede halten' (to give a speech).
Nach der Wahlniederlage trat der Parteichef von seinem Amt zurück.
After the election defeat, the party leader stepped down from his position.
chairperson
'der Vorsitzende' and 'der Parteichef' can both mean a person who leads a group or organization. 'der Vorsitzende' is more general and fits associations, parties, boards, or meetings. 'der Parteichef' only fits a political party and sounds somewhat more journalistic or colloquial. The words can be confused when talking about a party, because the party leader there is usually the chairperson. Outside politics, however, you do not say 'Parteichef'.

Nach der Wahl erklärte der Parteichef im Fernsehen die nächsten Schritte.
After the election, the party leader explained the next steps on television.
In unserem Sportverein ist der Vorsitzende für die nächste Mitgliederversammlung verantwortlich.
In our sports club, the chairperson is responsible for the next general meeting.