Lefteris Crispos, 20th Duke of Cyzicus

Lefteris Eric Crispos, 20th Duke of Cyzicus, (9 September 1814 – 21 May 1877), styled Viscount Artàke until 1842 and Earl of Tryphaena between 1842 and 1858, was a Diadochian peer and Liberal Party politician.

He was the son of Telemachus Crispos, 19th Duke of Cyzicus.

At the 1842 general election he was elected unopposed as a Member of Parliament (MP) for Artàke, a seat held by his father from 1829 to 1836. He was returned unopposed at the next three general elections, and held the seat until he succeeded to his father's peerage in 1858. He died childless in 1877 after a long illness and was succeeded as Duke of Cyzicus by his younger brother Alexander Augustus Crispos