Provided is a variable focus liquid lens using electrohydrodynamic flow of a fluid. The electrohydrodynamic liquid lens includes a housing having an annular passage therein; a first liquid occupying a portion of the passage; a second liquid occupying the rest of the passage and kept in the state of being separated from the first liquid; and a control electrode installed to be in contact with the first liquid in the passage. An interface between the first liquid and the second liquid has a curvature and plays a role as a lens. The control electrode changes the position of the interface by causing the electrohydrodynamic flow of the first liquid.
