Abstract: Methods and systems for particle classification are provided herein. A plurality of images of fluids/samples of pharmaceutical products, drugs, medicines, etc., may be analyzed using one or more machine learning models. The one or more machine learning models may comprise, for example, a convolution neural network. The one or more machine learning models may identify and classify one or more sub-visible particles in each image. The one or more one or more sub-visible particles may comprise, for example, cells, pathogens, protein aggregates, silicon oil droplets, fibers, air bubbles, glass particles, a combination thereof, and/or the like.