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BL Lacertae has been the target of four observing campaigns by the Whole Earth Blazar Telescope (WEBT) collaboration. In this paper we present UBVRI light curves obtained by the WEBT from 1994 to 2002, including the last, extended BL Lac 2001 campaign. A total of about 7500 optical observations performed by 31 telescopes from Japan to Mexico have been collected, to be added to the ∼ 15600 observations of the BL Lac Campaign 2000. All these data allow one to follow the source optical emissiondoi:10.1051/0004-6361:20035895 fatcat:va46bq4y4ndrzdadrnw2gf4wdu