We considerHilbert transforms along curves$\Gamma$ on the Heisenberg group. In particular, necessary andsufficient conditions for the $L^2$-boundedness are given for$\Gamma(t)=(t,\gamma(t),0)$ when $\gamma$ is even or odd andconvex on ${\Bbb R}^{+}$. 1991 Mathematics Subject Classification: 42B20,42B25.