ABSTRACT. We present a catalogue of 233 BL Lacertae objects compiled through an extensive bibliographic search updated to mid-1995. A large fraction of the sources listed in the catalogue belongs to well-defined samples and can be used for statistical purposes. A smaller fraction consists of miscellaneous (but confirmed) BL Lacs and of objects classified as BL Lac candidates. We discuss the selection criteria of the different samples, report the discovery of two previously unnoticed BL Lacs in the Palomar-Green survey, and comment on the possible association of some of the still unidentified high galactic latitude gamma-ray (EGRET) sources with BL Lacs. Some statistical properties of the catalogue are also briefly discussed.

Key words: catalogues - galaxies: active - BL Lacertae objects: general - radio continuum: galaxies - X-rays: galaxies.

Table of Contents

• INTRODUCTION
• THE CATALOGUE - Table 1
• Radio surveys and catalogues
• The 1-Jy sample
• The S4 sample
• The S5 sample
• Optical surveys and catalogues
• The Palomar-Green sample
• The optical variability sample
• The optical polarization survey
• X-ray surveys and catalogues
• The EMSS sample
• The EXOSAT sample
• The HEAO-1 sample
• The Slew survey sample
• The RASS sample
• The WGA and ROSATSRC catalogues
• Gamma-ray catalogues
• Miscellaneous objects
• Uncertain and candidate BL Lac
• STATISTICAL PROPERTIES
• REFERENCES