California Institute of Technology (Caltech) offers a number of Masters scholarships for international students to support their studies in various fields. Some of the available scholarships are:

1. International Fellowships: This program provides full tuition and a stipend to outstanding international students pursuing Masters degrees at Caltech.
2. Moore Fellowship: This fellowship is awarded to incoming graduate students in engineering or applied science, and provides full tuition, a stipend, and research support.
3. Resnick Sustainability Institute Fellowships: These fellowships support Masters students in research related to sustainability, and provide full tuition, a stipend, and research support.
4. Linde Institute Fellowship: This fellowship is awarded to Masters students in economics, and provides full tuition, a stipend, and research support.
5. Center for Data-Driven Discovery Fellowships: These fellowships support Masters students in research related to data science, and provide full tuition, a stipend, and research support.

To apply for these scholarships, international students must first apply for admission to their desired program at Caltech. They can then check the individual scholarship requirements and deadlines on the Caltech website and submit their application accordingly. It is important to note that some scholarships may require additional application materials, such as essays or letters of recommendation.