Shivagnanam, known by the stage name P. Madhuri, is a South Indian playback singer.

She was a part of an amateur drama troupe when Malayalam music director G. Devarajan happened to watch one of her performances at Madras.

She was introduced to films by Devarajan through Kadalppalam (1969), in which she sang the famous Mappila song "Kasthuri Thailamittu Mudi Minukki".

[3] Devarajan handpicked her and groomed her into one of the most successful Malayalam playback singers of all time.

She was probably the fourth most prominent female singer after S. Janaki, P. Susheela and P Leela in Malayalam in the 1970s and mainly sang songs composed by G. Devarajan Master.