Abstract. The fifth conference on astronomy and space science is a result of active contacts and joint research programs between the Bulgarian and Serbian astronomers during last 10 years. In the paper the main results from the four joint conferences held in Belogradchik (Bulgaria), Gamzigradska Banja (Serbia), Gjolechitsa (Bulgaria) and Belgrade, are summarized briefly. We report the rising interest to participation in the conferences from both sides and also from astronomers from other European countries. Bulgarian-Serbian bilateral contacts in astronomy are on the bases of the renewed bilateral collaboration between Bulgarian and Serbian Academies of Sciences, as well as the regional Balkan collaboration in Astronomy and Space sciences and programs supported by UNESCO. This 5th conference with more than 75 participants confirm the tendency of enlargement of the Bulgarian-Serbian joint work in Astronomy and Space Sciences.

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