  The interstellar medium of Centaurus A (NGC 5128) has been studied
extensively in recent years, using mostly molecular lines tracing low to medium
density gas (500 to several $10^3$ cm$^{-3}$). The amount and distribution of
the dense molecular gas was largely unknown. Here we present new millimeter
data of the HCN(1-0), CS(2-1), and CS(3-2) rotational transitions towards the
nearby radio galaxy Centaurus A observed with the SEST on La Silla, Chile. We
obtained spectra of the HCN(1-0) emission which traces dense 10$^4$ cm$^{-3}$
molecular gas at the center and along the prominent dust lane at offset
positions $\pm60^{\prime \prime}$ and $\pm100^{\prime \prime}$. We also
obtained a few spectra of CS(2-1) and (3-2) tracing densities of $\sim10^5$
cm$^{-3}$. The emission in these lines is weak and reaches a few mK at the
available angular resolutions of 54$^{\prime \prime}$ - 36$^{\prime \prime}$.
At the central position, the integrated intensity ratio I(HCN)/I(CO) peaks at
0.064, and decreases to $\sim$0.02 to 0.04 in the dust lane.
