An asterisk (*) indicates a full congress; all other meetings have been international working meetings, unless indicated otherwise.
| 1962 | Crésuz, Switzerland |
| 1963 | Wolfsburg (nr Essen), Germany |
| 1964 | Taizé, France |
| 1965 | * Fribourg, Switzerland |
| 1966 | Lugano, Switzerland (Foundation of UL) |
| 1967 | Pamplona, Spain |
| 1968 | Neustadt, Germany |
| 1969 | * Turin, Italy |
| 1970 | Amsterdam, Netherlands |
| 1971 | * Essen, Germany |
| 1972 | Strasbourg, France |
| 1973 | Regional meetings: Kassel, Germany; Montserrat, Spain; Verona, Italy; Rio de Janeiro, Brazil; and Wood Hall (Leeds), England |
| 1974 | * Strasbourg, France |
| 1975 | [Failed joint project with World Council of Churches: Geneva, Switzerland] |
| 1976 | Candia Canavese, Italy |
| 1977 | Jambes (Gentinnes, nr Namur), Belgium (first proposal for UL Document I) |
| 1978 | Luxembourg |
| 1978 | * Strawberry Hill, United Kingdom |
| 1979 | Candia Canavese, Italy |
| 1980 | * Assisi, Italy (UL Document I launched) |
| 1981 | St-Maurice, Switzerland |
| 1982 | Walbourg (nr Strasbourg), France |
| 1983 | Varese, Italy |
| 1984 | Paderborn, Germany |
| 1985 | La-Baume-lès-Aix (Aix-en-Provence), France |
| 1986 | Capiago (Como), Italy [with excursion to Lugano, Switzerland] |
| 1987 | Waterloo, Belgium |
| 1988 | Montserrat, Spain |
| 1989 | Worth, England |
| 1990 | Altenberg, Germany |
| 1991 | Innsbruck, Austria |
| 1992 | Candia Canavese, Italy |
| 1993 | Bovendonk, Netherlands (first stirrings of what would become UL Document II) |
| 1994 | Rueil-Malmaison (Passy-Buzenval, Paris), France |
| 1995 | Bari, Italy (formal proposal for UL Document II) |
| 1996 | Stamford, Connecticut, USA |
| 1997 | St-Maurice, Switzerland |
| 1998 | Oscott (Birmingham), England |
| 1999 | Kirchhundem, Germany |
| 2000 | Soesterberg, Netherlands |
| 2001 | Montréal, Canada |
| 2002 | Valpré (Lyon), France (UL Document II agreed) |
| 2003 | Gazzada (nr Varese), Italy (UL Document II published) |
| 2004 | St Pölten, Austria |
| 2005 | Worth, England |
| 2006 | Bex (St-Maurice), Switzerland |
| 2007 | Modra – Harmónia, Slovakia |
| 2008 | Drongen (Ghent), Belgium |
| 2009 | Gazzada (nr Varese), Italy |
| 2010 | Kirchhundem, Germany |
| 2011 | Kamień Śląski, Poland |
| 2012 | St Walfroy, France |
| 2013 | Worth, England |
| 2014 | Loreto, Italy |
| 2015 | Traunstein, Germany |
| 2016 | Gazzada, Italy |
| 2017 | Brno, Czech Republic |
| 2018 | Rome, Italy |
| 2019 | Ellwangen, Germany |
| 2020 | Online |
| 2021 | Paris, France (online) |
| 2022 | Brno, Czech Republic (online) |
| 2023 | Lyon, France |
| 2024 | Maredsous, Belgium |