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We report the evidence of a new $\beta$ Cephei type variable located in theSouthern open cluster \astrobj{NGC 6200}: \astrobj{ALS 3728}. Spectroscopic andphotometric observations of NGC\,6200 stars were carried out at the SouthAfrican Astronomical Observatory (SAAO) in 2011. It was found that \astrobj{ALS3728} has a frequency of about 4.95 d$^{-1}$ with highest amplitude. The staralso shows a remarkable stillstand phase just before its light maxima which isa typical characteristic occurring among these type of stars. Furthermore, amode identification is applied for the dominant frequency that is calculatedfrom the Fourier analysis.

New {\beta} Cephei variable in the Southern open cluster NGC 6200: ALS 3728