Weblogism

UTF-8 Euro Symbol in LaTeX

XeLaTeX

XeLaTeX is the easiest approach, it works out of the box:

\documentclass[a4paper,10pt]{article}

\usepackage{xltxtra}
\usepackage[french]{polyglossia}

\begin{document}
Donne-moi 5\,€.
\end{document}

“Classic” LaTeX

LaTeX requires the use of textcomp to get the euro symbol:

\documentclass[a4paper,10pt]{article}

\usepackage[utf8]{inputenc}
\usepackage{textcomp}
\usepackage[frenchb]{babel}
\usepackage[T1]{fontenc}

\begin{document}
Donne-moi 5\,€.
\end{document}