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The Be X-ray Binary 4U 0115+63 was observed by Large Area X-ray ProportionalCounter (LAXPC) instrument on AstroSat on 2015 October 24 during the peak of agiant Type II outburst. Prominent intensity oscillations at ~ 1 and ~ 2 mHzfrequency were detected during the outburst. Nuclear Spectroscopic TelescopeArray (NuSTAR) observations made during the same outburst also show mHz quasiperiodic oscillations (QPOs). Details of the oscillations and theircharacteristics deduced from LAXPC/AstroSat and NuSTAR observations arereported in this paper. Analysis of the archival Rossi X-ray Timing Explorer(RXTE)/Proportional Counter Array (PCA) data during 2001-11 also show presenceof mHz QPOs during some of the outbursts and details of these QPOs are alsoreported. Possible models to explain the origin of the mHz oscillations areexamined. Similar QPOs, albeit at higher frequencies, have been reported fromother neutron star and black hole sources and both may have a common origin.Current models to explain the instability in the inner accretion disk causingthe intense oscillations are discussed.

LAXPC / AstroSat Study of ~ 1 and ~ 2 mHz Quasi-periodic Oscillations in the Be/X-ray Binary 4U 0115+63 During its 2015 Outburst