Soft lithography is a technique that uses elastomeric stamps to create micro- and nano-scale patterns. It is cost-effective, versatile, and suitable for biological applications. It allows for the creation of three-dimensional and curved structures, and can generate well-defined surface chemistries. It is used in various applications including cell biology, microfluidics, and flexible electronics. Three common techniques are microcontact printing (μCP), replica molding (REM), and solvent-assisted micromolding (SAMIM). μCP is used to pattern alkanethiols and proteins on gold or glass substrates. REM is used to fabricate microfluidic devices in poly(dimethyl siloxane) and nanostructures in polyurethane or epoxy. SAMIM is used to create nanostructures in poly(methyl methacrylate). Soft lithography offers advantages over photolithography, such as lower cost and flexibility in materials. It is particularly useful for applications where traditional photolithography is not feasible. The protocol outlines the steps for designing patterns, fabricating masks and masters, creating PDMS stamps, and using these techniques to create micro- and nano-scale structures. The techniques are described in detail, including the materials, equipment, and procedures required for each step. The protocol also includes troubleshooting tips and anticipated results.Soft lithography is a technique that uses elastomeric stamps to create micro- and nano-scale patterns. It is cost-effective, versatile, and suitable for biological applications. It allows for the creation of three-dimensional and curved structures, and can generate well-defined surface chemistries. It is used in various applications including cell biology, microfluidics, and flexible electronics. Three common techniques are microcontact printing (μCP), replica molding (REM), and solvent-assisted micromolding (SAMIM). μCP is used to pattern alkanethiols and proteins on gold or glass substrates. REM is used to fabricate microfluidic devices in poly(dimethyl siloxane) and nanostructures in polyurethane or epoxy. SAMIM is used to create nanostructures in poly(methyl methacrylate). Soft lithography offers advantages over photolithography, such as lower cost and flexibility in materials. It is particularly useful for applications where traditional photolithography is not feasible. The protocol outlines the steps for designing patterns, fabricating masks and masters, creating PDMS stamps, and using these techniques to create micro- and nano-scale structures. The techniques are described in detail, including the materials, equipment, and procedures required for each step. The protocol also includes troubleshooting tips and anticipated results.