Lafontaine, French for "the fountain", may be:
- Henri La Fontaine (1854-1943), Belgian jurist and Nobel Peace prize laureate
- Jean de la Fontaine (1621-1695), French poet
- Louis-Hippolyte Lafontaine (1807-1864), Canadian politician
- Oskar Lafontaine (born 1943), German politician
- Pat LaFontaine - an ice hockey player
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