| L-systems | Lindenmayer systems: a fractal-based method for modelling branching patterns in plants |
| Labour allocation | Allocation of time for different activities for a labour pool |
| Lake model | Models hydrology, nutrients, pollution in lakes |
| LAMOS | 'Landuse Modelling System': a generic landuse modelling framework |
| Land-use change | Changes in land-use patterns across a landscape |
| Lindenmayer systems | A fractal-based method for modelling branching patterns in plants |
| Logistic growth | S-shaped or sigmoid growth; initially exponential growth, levelling off as a plateau (the 'carrying capacity') is reached |
| Lotka-Volterra | The authors of several classic textbook models of population dynamics |
| Lumped model | No division of model components into subclasses; non-disaggregated |