A by-election was held for the New South Wales Legislative Assembly electorate of Sydney-Phillip on 9 June 1900 because of the resignation of Henry Copeland () who had accepted the position of Agent-General in London. Daniel O'Connor was previously a member for West Sydney but had joined the Protectionist party for the 1898 Sydney-Pyrmont election.
<includeonly> Henry Copeland () was appointed Agent-General in London.</includeonly>