  We present self flux growth and characterization of single crystalline
AlMn$_2$B$_2$. It is an orthorhombic (space group Cmmm), layered material with
a plate like morphology. The anisotropic bulk magnetization data, electrical
transport and $^{11}$B nuclear magnetic resonance(NMR) data revealed an
antiferromagnetic (AFM) transition at 313 $\pm$ 2 K. In the magnetization data,
there is also a broad local maximum significantly above the AFM transition that
could be a signature of low dimensional magnetic interactions in AlMn$_2$B$_2$.
